Mountain Joe
IMO, it is very rare to find modern made caps that are poorly made by any company.
Remember when you read stories about people having problems with caps, there can be a lot of different reasons they are having problems.
Probably the biggest problem people have is the nipple cone size is too big for the cap they are using.
There is no set standard for the diameter of nipples or of caps so if the cone is a little large and the cap they are trying is a little small, the cap will not seat on the top of the nipple.
Often, changing to a different cap company can "fix" this problem if the new company's caps are slightly larger. A better fix IMO is to file the nipple cone down just a little until the cap fits like it should with the caps on hand.
Another problem can be caused if their gun has a damaged nipple where the top of the cone has been pounded into a small mushroom shape.
Caps placed on nipples like that often won't fire on the first hammer fall.
A weak mainspring in the lock can also cause the hammer to strike the cap with insufficient power to make it fire. (This is not common with new locks but some older CVA's and some Italian locks had this problem.)
Another thing that can cause problems on many modern factory made guns is the flame channel that connects the bottom of the nipple with the bore is partially filled with old fouling or it has oil in it because the owner over-oiled the bore and stored the gun butt down.
Then, there are the people who leave the old fired cap on the nipple while they are loading the next round.
This will keep fresh powder from blowing back to the bottom of the nipple where it can instantly ignite when the cap fires.
In other words, there are a lot of reasons a cap won't fire other than the company that made them.
Pyrodex and other synthetic powders have a higher ignition point than black powder. This, coupled with any of the problems noted above often leads to misfires.
If you are shooting one of these synthetic powders you might find the "Magnum" or RWS caps work a little better.