Like the title says... I don't know if I have an absolute favourite, but maple is really nice to turn. Mun ebony is also a fun one, its very hard and dense, but very non-porous and consistent, so sharp tools just cut through it so smoothly it feels very nice. I actually haven't worked with birch much (if at all?), but I feel like it is one I might like, based on how it feels/plays as a kendama. Least favourite: zebrano? The way it smells when you work with it is awful. I once inhaled a bunch due to a mask not fitting on quite right, and it was fucking terrible. WEAR YOUR MASKS. I swear if nothing else, that episode probably made my body react to it cause it thinks I'm gonna die. Wenge is kinda nasty too. It makes really small, sharp woodchips, and they're a little toxic to most people, so anytime I've gotten a splinter they get all red and pissed off until you pick it out. Luckily the tester kendama I made was one I jammed the crap out of, and I noticed that wenge was pretty terrible for durability, so I didn't really use it much after that. I have this big chunk of a northwestern ironwood that was given to me by a friend, and though incredibly old and stable, its like... incredibly sappy! Its so strange, I've never seen anything else like it, when I finished working all the woodchips were sticking to my arms, and if I grabbed the workpiece while it was still spinning I would get streaks of sap that would turn black from picking up dust all across my palms. Very strange stuff! It made me kind of uneasy, so the only thing I've made so far is a ken that is kinda B-grady by my standards for being a bit skinny. Soo.. I'm not sure how it plays yet. haha. I have a love/hate thing with B&W ebony too. I love how beautiful and varied it is, but it has the same sorta zebrano smell to it (though it affect me MUCH less severely than the zebrano smell haha. I can tolerate it for sure). Every time I work with it, I'm never really sure what its going to look like until I'm finished. It almost always turns out awesome!