I just asked which one is your favourite and why? The ''best'' for you... it not must be the strongest or something...Most powerful? Or the most useful? There is no "best" kekkai genkai, considering they can all be countered somehow.
Agree with you :anbus:I think wood release is the most useful. You can grow anything. ANYTHING. You could literally supply a village with everything it needs.
Byakugan is perfect for infiltration and watching a village.
Sharingan is actually perfect for the Police, which is such a great role that Tobirama put the uchiha in.
Dust release, Lava Release, and blaze are great for battle.
I don't know about the rest.