For stamina, an archer would probably be better served with regen, while a melee warrior is better off with just a large pool of stamina.
For health regen, Im not really sure. I think that sword and board warriors msy benefit from it most. I do believe health regen is useful, and that it can be used effectively even in combat, In an extended battle, it can be worth potentially 100s of health points. But health regen is different than stamina or magicka, and can be potetnially useful or worthless for all characters.
Of course, a mixture of both is probably beneficial, but some characters would be better off leaning towards one or the other.
Just a thought I had, not much point to this topic i guess, but just something I was thinking about.
Would you agree with this assessment?