You're forgetting the best choke...FULL!!!!
i personally shoot a 20 gauge with I/C and modified on pheasants with #5's year round. I must be a poor shot because i very rarely butcher one, even in early season. My dad shot a model 37 12 gauge full choke all the time, and i don't remember him missing many. Best thing to do is get out and pattern and practice. I think half the battle is in my head anyway.