Some people have a personal problem with kingklick because there was a big controvercy about him stealing roms and things like that, but i think it does have more to offer than hydra (even though hydras are more than suffice)
I realy dont see much of a difference between CFS and BFS besides the benchmarks....they are wayyy better (quadrant) but do seem to lack a bit with linpack, but those are just numbers, and those numbers can be easily manipulated, so they are generally more for bragging rites....PERFORMANCE IS WHAT COUNTS, NOT NUMBERS!!!!!!!!!!!!!!!!!!
But i feel BFS has been most stable, even compared to hydra.
and as for all the other features, HAVS AND AVS are great to have because they channel power in a different way, thus aiding battery life...and besides, you can overclock to 1.2ghz...that brings back some good times from moto droid days!!!
But if you really just want a bit of speed, some nice stability, and a nice undervolt, hydra is the way to go...ejhart is a reputable dev, too....
In the end, its whats best for you....kingxkenels are the ones i reccommend with all my roms, but i do heel that hydras get the job dont just fine