Your best bet is to make your own solo transcriptions. Get some software that slows down music without changing its pitch, and use it to transcribe your favorite Gary Burton solos. Like most things, when you do it yourself it's much harder and slower, but you also learn much more deeply and completely. If you simply want to play Gary Burton solos, then someone else's transcriptions are fine; if you truly want to understand his play and get there yourself, you've got to do the hard work yourself.

Your best bet is to make your own solo transcriptions. Get some software that slows down music without changing its pitch, and use it to transcribe your favorite Gary Burton solos. Like most things, when you do it yourself it's much harder and slower, but you also learn much more deeply and completely. If you simply want to play Gary Burton solos, then someone else's transcriptions are fine; if you truly want to understand his play and get there yourself, you've got to do the hard work yourself.