Okay about to get a heal for my heavy weapon and I hear more people talking about conviction then resurgence. Is this only for the cool down for MSA since conviction doesn't heal for much with high pre can't imagine it being much of a heal without it.

If you have high Pre and/or MSA, take Conviction (note: better not have energy issues)
If you have high Con, take Resurgence (and maybe craft click-heals)

If you have Primal Aura, take both. ;)

The best answer is to take both (if you can squeeze it) and then rank them both to 3.

Conviction scales more with rank than it does with presence so even with 0 presence its still a good 800 hps a click at R3, which isn't bad. Use resurgence for a big heal and conviction to keep you topped up while resurgence cools down.

This is what I do.

I feel having both of these...even without PRE for Conviction...is good for resistance based builds.