I've found that keeping the snail area or the drum clean and ensuring the nipple is clear is more important than which cap one chooses. Of late, I've been using home made caps in a Forster "Tap-O-Cap" tool. In the last 30 years I've not had one misfire due to caps. The commercial caps I've used are Remington and CCI. Now I suppose the next time I attempt a shot, the Gods of brimstone and fulminate will see to it that I am thoroughly humbled. As I'm a married man, that will take some doing, the Gods of home and hearth with the loving ministrations of my bride have seen to that well enough already.
I also read somewhere, can't remember where, that in the day the mildest caps were prized as the most consistent and reliable. How exactly that was arrived at, I've no clue, but considering the users were sometimes up against hostile adversaries, both two and four legged, who "hunted back", I'd tend to give considerable weight to their opinions.
Three Hawks