There are certainly lots of choices and it all really comes down to personal preference. If possible, it's best to handle as many as you can see what feels best to you.
I almost always opt for guns with black synthetic stocks and a matte finish with at least a 26" barrel. If it's a choice between 24" and 28", I'll take the 28" barrel.
Unless the gun is only available in 3.5" chamber, I'll take the 3" chamber since that shell really does all that can ask of a turkey gun or for that matter a waterfowl gun with modern shotshells.
I just received 2 new Mossberg shotguns, a 20 gauge 500 with a 26" barrel and a 12 gauge 930 with a 28" barrel, both with black synthetic stocks and matte barrels. They are versatile guns that can be used for just about any purpose.
I know a lot of folks like camo guns and those with shorter barrels, those are just my preferences.
I've also gone through a number of different stock configurations and have found myself back to a traditional hunting stock. I will however put an ATI AKITA adjustable hunting stock on the 20 gauge 500. That way Doris and I both can shoot the same gun with a simple adjustment of the LOP.
I hope that helps some.
"If he's out of range, it just means that he has another day and so do you."