OP...you're probably going to have to go with a Briley LF since they don't make the Terror 720. If you can still get a Terror 735 that would be my choice over the Briley.
I haven't shot a .735 in any brand, but have my doubts about it/them. I've patterned loads with my full .740 and they aren't even close to the patterns I get with the .745 choke. The patterns shot with the .740 had less pellet density and were very blotchy, with a lot of holes. Don't think I could be convinced to change my .745 choke for any other size.
ive tried the lot of them chuck they dont work for the loads and velocity i use ,ive a watermeloned .705 that i screwed up with using large lettered shot despite hajaar saying it was ok to do so.
smaller pellets /payloads appear to shoot the tighter constrictions as youd imagine they would do,but when you ramp the velocitys and increase payload size from 11/2oz-15/8oz up beyond 1450fps youd be better off with factory chokes than those tight terrors and agree with jeffs take on small shot and the 10ga,but each to his own.,also when you realise and understand what happens when a large mass of solid steel incorporating big pellets smacks into the choke profile at velocity with higher breech pressures,its no big surprise when you see the results for yourself.
briley i/m and l/f cut the mustard with big pellet loads for me also.
i think once you dip below .740 constriction your asking for negative results with big, fast pellet payloads