I'd try 'em both, you can't always predict what they'll take. This happened some years ago, but it was with grubs, not worms, but the principle's the same.
We were fishing grubs on jigheads, my partner with a curly tail and me with a split tail. I was getting skunked and he had me 6-0. Finally I switched to a curly tail and caught something almost immediately. The final score was 6-4. It's not everyday that something happens that's so clear cut, but it proves that it can and does happen.