yea... q/a fits better.
but seriously...
there is no such thing as the "best" kernel.
ideally there should be one, but reality is different.
im saying that cuz not all evo's are 100% the same, not all users use the phone in the same way, not all locations have the same conditions, etc. etc.
try one, if u happy with it... stick to it... if not, move on to another one until u find one that u happy with.
the only thing to keep in mind is that u would like to give each kernel u try a good 3-4 days before even thinking about switching just because u can't judge battery life after only a few hours or even a day or two... u would need to wait it out.