Kinda runs the gamut.
My absolute biggest was on a Biffle Bug. I caught several REALLY big ones on a jig. Second biggest I've caught was on a frog. 3rd biggest was on a rattle trap (the bigger sized red eye shad).
I'd say that my best "big bass" producer is the bug, then jig. Probably because I ALWAYS throw a bug. If I don't throw a bug, then a jig is my second choice. When I get desperate, I toss rattle traps.
So, mine is based simply on what I use.
RIP little Nitro