I primarily use 5/0. I like a smaller hook for presentation, i think its a mental thing. Smaller hook equals a more natural presentation. It may also equals a few less fish but i don't miss many.
7/0 Gami Octopus Circle for me. Been using them so long I wouldn't know how to hook a fish on a J-hook anymore. The circles also slide thru the boulders much easier than J's.