I am tweaking/finalizing the way i handle magic/powers and feats and want to use a uniform system for all PCs for speed of play and less bookkeeping. I have always liked the idea of magic having a cost to self-regulate it and also like the ideas in @Khan 's books of allowing feats for martial characters that cost HP as well.
I am wondering if people use Stun or HP in their games? The pluses of using Stun is it doesn’t cost HP and players are more likely to use it. The pluses of using HP is it’s one less thing to track, but it means players are more careful with their use.
I’m just curious what you all do and why you settled on the system you use?