Hi Dave, there's been a lot of discussion on that subject if you do a search...at least I think you can here. Colwood and Razertip are popular among carvers and pyrographers. Optima and Detailmaster are also widely known and used. Pros and cons but depending on what you intend on doing with it you might have some things that are more important. Flat/gourd burners tend to like polished tips over non polished tips. Some prefer foam grips over cork. So, depending on what you intend to do with it you have to decide what will work best for you.
I'm a flat/gourd burner and I very much prefer foam grips and polished tips. Polished tips will not drag, accumulate carbon as much and are easier to clean. I prefer foam grips although my friend Orchid prefers the cork grip so that part is very much personal preference.
Nedra