What is the best dropshot hook?  Gammy dropshot, Owner Mosquito, or something else?

The Standout Hooks are my favorite for dropshotting

http://www.standouthooks.com/

gamakatsu drop/split shot hooks in size 4 or owner downshot hooks in 1/0. i use the gamakasu's with small, thin baits like 3" senkos, and i use the owner's for texas rigging thicker baits like KGM tad poles.

I use the owner mosquito in 1 or 1/0 99% of the time.

I second fourbizzle's reccommendation.

I use both and seem to have more hookups with the Gammies. Sizes 1 and 2 for me, moreso with size 2 for both Owners and Gammies.