As everyone has stated, I think it depends on the powder. If I am shooting 777 pellets, I use the T7 primers as it reduced my crud ring compared to the CCI 209M.
For Blackhorn I use the Fed 209A's as I could not find anymore CCI 209M primers a month ago.
If you were going to pin me down and say pick one... CCI 209M or FED 209A. They may leave a crud ring with some powders, but they ware compatible with BH 209 and I can also use them when reloading shotgun shells. I like the magnum primers and either one of these the gun should go BOOM!!!!