I really liked the Subrosa when I saw it online for the first time. I am not a fan of AO, but the mechanism can supposedly be removed. It did not feel as robust as I would have liked when I handled one at Willey Knives.
I really liked my Rukus, but it seemed like the Axis lock could not withstand the knife opening fast. It would loosen considerably after a good period of opening and closing. Still one of my favorite blades, and while the handle was very grip friendly, it didn't look good.
Never had a Protech, so I can't comment on it. However, buddies that carry and use autos, recommend the Protech brand.