I have caught bass on everything from a size 14 possie bugger to a 5/0 chenille worm tied on a huge soft plastics hook. There’s a time and place for both. If I had to lean towards a few it would be a large wormy leechy creature fly or giant wooly bugger style fly a huge baitfish made out of rabbit/ dubbing brush or a bucktail like a clouser. And then a surface fly like a foam frog or dragonfly, mouse, dahlberg diver, or a popper. I’ve also had success fishing balanced flies near structure under indicators.
with all of these preferences considered, the most success I’ve had fly fishing largemouth bass in specific is with the large weedless creature/leech looking flies in shades of olive/black/purple/chartreuse. Cast out, let sink for a while and watch for take on the drop, if no take, use a strip,strip, short pause retrieve. Make your strips about 8-10 inches and about a second apart not too much not too little, pause for just a couple of seconds.
with topwater and waking flies, cast out and let it sit until the rings around the fly settle. A lot of times a fish will grab if you let it sit. Then I start a short, hard consistent strip back to the boat/tube/bank that creates a wake or trail which the bass seem to love. I adapted all of this from my buddy who use to fish bass 24/7. So a lot of it is taken from the pages of spin anglers but definitely holds true with flies as well.
here are some bass on the fly photos from years past
-Brandon