I'm not interested in "hottest" which is a pretty much meaningless term. I'm interested in "most consistent" which will yield the most uniform ignition across a number of rounds. After all, accuracy is all about getting several bullets to hit the same target in the same place.
Primers that all contain the same amount of stryphate, that have anvils set to the same depth,,,,,etc do something for accuracy.
After trying all the brands over a lot of rounds and a lot of years, for general use I use Federal standard primers. For match rounds I use their gold medal primers and yes, I do weigh each and every match primer.