TSS shoots good in just about any choke. I think the top dogs are IC, Jebs, and Sumtoy.
In my SBE2 I shoot the IC .665 - my buddies shoot Browning Maxus and SX3, both shoot IC .665 - Excellent, even patterns.
In my 20ga M2 I shoot a RR .570 - It throws a good even pattern - I had the IC .555 but it was too tight for my liking...