Like Rikeman said, it's mostly a matter of preferrence. I have never had good luck with CCI caps. I've had misfires and hangfires occasionally. I prefer Remington and haven't had any problems with them other than they're harder to find. As for hotness of the caps, that's really only important if you shoot substitutes that are harder to ignite. In fact, more powerful caps such as magnums or musket caps can have a negative effect on accuracy in some guns. The extra blast tends to start the ball moving off the charge before the charge has had a chance to ignite fully. This can cause inconsistent pressures and create fliers in your group, or groups that aren't as tight as they could be. I wouldn't be tempted to use them unless you've tried everything else and you still can't get good ignition.