A small question about game mechanics...

After conquering a province from rebels, do you:
a) Execute them all.
b) Execute the ring leaders.
c) Release them all.
???

Usually I make this choice to simply generate more ambient, for instance if they revolted against my excomunicated enemy and then I conquer them I release them all; if they raised against an ally or in a province I'm just starting to convert I kill the ringleaders but if they revolt against myself I give them the teat that punny human cattle like them deserve... *ahem*



But I'm still really ignorant about how do this choices affect the game mechanics.
Do they influence the chances of a revolt in that and/or other provinces, the income from confiscated lands and/or the influence of the king? Are there any other parameters affected by this?

Thanks in advaced for the feedback.