Hi Susan,
first before I comment on the wood I have to say something about the firefighter burning you did. I didn't realize that was your pattern. I saw it when it first came out I guess on the back of one of the magazines and I did two burnings of it. The first I used the pattern as is and the second with modifications (changed the lettering on the shirt so it's the way the fire dept in NY has it on their clothing, used a hat from an actual firefighter at the site and used color which I no longer do)...thought you might like to see what I did with your pattern. The first one I sent to Mayor Giuliani and the second one I donated to the local Fire Dept in Texas.
Anyway, back to the wood. When I started burning basswood was my favorite for much the same reasons Susan mentioned it was boring

...clear, light colored and no grain. Yup, Susan is right it doesn't have a lot of personality but for some pieces that's what I need and as a beginner it is much easier to deal with.
My feeling is that the selection of wood really is dependent on many factors: your personal preferences, the style of burning you do and the subject of your burning. In the past when I was first learning and developing my style I always burned with basswood or italian poplar because they are easy to burn on.
I work with a variety of woods now and my selection is made depending on what I'm doing. I work with maple, both plain plaques and burls. I also work with italian poplar and birch plywood as well as some basswood. Each piece I do, I try to match with a wood that will compliment what I'm doing. Something that is rustic and earthy I might still use basswood with the bark edges or I might choose a burl with natural edges. It really is dependent on the actual piece and what would work best with it. When I decided to do a small golden eagle I decided it needed wood with lots of personality so I searched my wood pile and found a small burl that was a "reject" and it just looked great on that piece of wood. On a piece of basswood it would have just been a great eagle on a plain piece of wood and although my 1st golden eagle won many awards including best of show it lacked the personality that this little one has.
I used to just like burning on the light woods because of the contrast of light wood and dark burnings but now I enjoy woods that are darker with more grain and have more personality and the burls certainly do have more personality. I still like the contrast of lights and darks and still do use basswood and poplar but I am expanding my horizons with slightly darker woods lately and loving it.
Like Susan I do like working on 1/8" plywood because it fits so nicely in a frame without having to get a custom frame made but I have taken basswood slabs, removed the bark and had them custom framed and they turn out beautiful.
In many cases basswood, even though it is light and little personality works well with portraits (with my style of burning) and many other things where you want to focus on the burning and nothing more. My portrait of Chief Joseph didn't matter what it was burned on. I could have used toilet paper because the entire piece of wood was covered except for small selected sections. I chose the basswood with the bark because I wanted a rustic look then when it was finished I was talked into removing the bark and having it custom framed. No regrets on that one.
I like maple because it is a hard wood and it has a lot of personality. It takes longer to burn but you get nice crisp, clean detail with it.
Basswood gives a softer look and often for my style of burning it works well.
Italian poplar is very similar to the basswood. It's clear, very little grain and is easy to burn and gives the same effects as basswood and like basswood has very little personality.
I agree with Susan on the Birch and use that from time to time as well now. It is also more clean and crisp for details than basswood and italian poplar.
What I have found is that for beginners burning on basswood and italian poplar is better. It is easier to burn and that is mostly what they burn on in my classes. It 's easier to focus on learning techniques and gaining control when you don't have to fight with grain. As they gain skill and confidence I recommend they experiment with other woods and they can move on to the harder woods with more ease.
I always tell people to experiment and see what works best for you. Learn from everyone you can and then find what works for you. Everyone has their own preferences in wood, pens, styles of burning and you need to take all factors into consideration when making those choices. There's no right or wrong way of burning and there's no right or wrong wood or pen. Susan and I have totally different styles of burning and favorite pens and she burns light and I tend to burn dark. Neither style or preference is right or wrong or better than the other it's just what appeals to you and what works best for you. I love the look of an old sepia photo and that's what I tried to achieve. When I perfected that technique I started experimenting with different woods, techniques and textures from time to time so don't ever think that you have to use a particular style or technique to be good.
When I was first learning (I'm still learning every day) and starting to use my "smooth shading technique" someone criticized my style of burning saying it's not the "right way to burn and that the wood shouldn't be shiny" and I just chuckled to myself. I started looking around at what other people were doing and found some very well known pyrographic artists (David Kreider and Linda Sales) who also use a similar style and I figured if it worked for them it must be ok so I continued to do it and still do. Several years later that same person who criticized my style of burning started using the same style so I guess it's not such a bad style of burning after all.
So, the bottom line is learn from everyone you can, experiment, play with different techniques and woods, different pens and find what works for you. Everyone is different and if everyone burned the same this would be a very boring world.
I added a couple of pieces I did several years ago to show some other interesting woods to work on. The wood was given to me at a show by one of the wood vendors who wanted me to see how I liked burning on it. I love burning at the shows anyway so I sketched out some designs and began to test out the wood. I did not like burning on the Tupelo (left with mushrooms) but I LOVED the Holly (sunflowers on the right). The tupelo had a greyish cast and felt like burning on a marshmallow. Hard to describe. The Holly was a harder wood and I got great detail working with it.
Nedra