I have had a lot of gear oil through my bike as I am sometimes slipping it out a bit differently then the drag guys. I actually set the bike up to come out of the turn so that it gets on to the pipe and also manage to keep it take enough to not blow the tires off. Needless to say, I burn down a lot of oil. Tree brands I find best are the Royal purple, Amsoil, and B&M. The latest is the Royal purple but I havn't got to actually race with it just ride so I'm still on the fence but i can vouch that it is smooth shifting and has taken some hours on a pretty stout motor with out needing a change. Gave it the ol stink finger test after 10 hours and it was still damn fresh.
The Amsoil I have ran about anything they make through my bike. The Super Shift ATF , Severe Gear for motor cycles and ATV, synthetic gear lube, and Torque Drive all come to mind. The ATF super shift being the best bang for the buck. It shifted smooth and consistent with zero chatter or missed shifts. It was also nice to tune with. It allows slip with out any inconsistencies. The power sport synthetic gear box lube acted the same, however it was short lived and needed frequent changing. The Torque Drive is tough and lasts a long time. Great for a trail bike but it doesn't allow slip and will chatter if you force it to. The last was Severe gear, junk in a banshee. Just had a case of it laying around from my girl friends dad. He tried it in his triumph and hated it. So I took it and ran it but it had to be changed fast and never rode smooth or shifted well.
The last was the B&M Trick Shift. Had a ton of it left over from a 700r4 build so it made its way in to the banshee. It handles heat well, shifts ok, allows slip, but it is short lifed in a banshee. Terrible price to.