I think it depends on your choke. If shooting 1 ounce of 7.5's I prefer Full choke because there's only 350 pellets. There is a slide rule gizmo called a Choke Chooser that calculates patterns and recommends chokes based on shot size and payload.
1 ounce #7.5, Full choke gives 22" pattern at 35 yards.
1 1/8 ounce #7.5, IM choke gives 23" pattern at 35 yards.
1 ounce #8, IM choke gives 24" pattern at 35 yards.
1 1/8 ounce #8, M choke gives 25" pattern at 35 yards.
The above assumes a 2 pellet hit threshold to break a target.
So to answer your question, I prefer #8. There is an opinion that 7.5 has more energy and it only takes 1 hit but there's less pellets and more chance of a hole in the pattern the target can fly through. So, full choke.