I like the 3" hornady Nickel BB. I say this because the T shot is way to expensive, so i don't care how good it is. I have tried the 00, and 4B and feel that it's a case of getting those BBs in the right place to make the stop. I pay $14 for a box of 10 and at $1.40 cents I want every single bb i can to hit that spot.
They work, i use them, and I won't change unless something out there can tell me otherwise.
I also shot a bobcat at 10yrds year before last, and when i skinned it out and put it up, I wasn't docked for damage at the buyer. If you are shooting 75-100 dollar coyotes up there, pelt damage is something to think about.