Bill is correct that Sally's or Saral is the best. I've had people complain about having lousy results with graphite until they try this. Both are made by Saral and it is the best quality and both are the same just sold in different packaging. I've been using it for many years and have never had a problem with it not showing up or being able to remove it if necessary.
In classes I give students red pens to trace their patterns. Works like a charm and you can see where you left off transferring so you don't have to lift up the pattern and chance that it moves when you put it down. I also recommend using painters tape rather than masking tape.
Again these are all personal opinions based on my experience and not necessarily the only way to do things....just the way I do it and have found what works and doesn't through trial and error!
Nedra