A couple of thoughts...what shell/load are you planning to shoot? I ask because the hot new load this year, the Winchester blah, blah, blah is one tight grouping son of gun. I actually did NOT use my normal turkey choke tube and went with the factory supplied Improved Modified so I didn't have such a tight pattern. This new load is specially designed to stay tighter at longer distance and from what I can tell, it works as advertised.
So I felt like if I used my tighter turkey specific choke AND this new shell that I would have a pretty small diameter for a pattern at say 20 yards. I did kill a turkey at about 35 yards with one shot out of this combination and he was DRT, so it seems like a pretty potent load to me.
With that type of a load, I would not hesitate to use a standard factory tube and with a youth hunter "behind the wheel", I might even go with a modified tube and keep the shots under 30 yards say.