Welcome to the short barrel thurkey hunting world.
Your question will have as many answers as there are hunters answering it!!!
Conventional wisdom says a longer barrel will pattern better.
However, each barrel, choke and load act differently.
The 24" would be a "safer" choice, however, many many birds are harvested wtih short barrel guns.
Barrel legnth can also be important if you are shooting from a blind/downfall/hide hole. Shorter barrels can be pointed quicker in thicker conditions.
Good Luck and be safe