which one will do lvl 4s faster?

i'd say nightmare with the right fittings.

and skills otherwise u miss alot

yeah i was missing a lot with my cnr but switched out a little bit of tank for a target painter (i went for the republic fleet one for 70mil) and im completing now much faster..
im still pretty low skill'd but all i needed for that 36% signature radius bump on targets was target painting lvl 1
thinking about trying out a rigor rig or two when i have my capacitor skills maxed, anyone have any thoughts on those? currently using large capacitor control circuits

i use atleast 2 target painter on my raven in pvp like 40-50% dmg increase on any ship smaller then a bs.

is there decreasing marginal utility from multiple target painters? Also, dont you lose resist/tank/cap stability using two?
I'm using this fit for my CNR, pending the training of some more skills:

highs:
7x Caldari navy cruise launchers

mids:
1x large shield booster II (going to move to xlarge when skilled and gist x or whatever when I have the isk)
caldari navy shield boost amplifyer
republic fleet target painter
2x mission specific active hardeners or invuln fields when I dont know what I'm up against
1x cap recharger ii

lows:
3x ballistic control unit iis (moving to caldari navy ones when I can afford them)
2x capacitor flux coils
3x large cap rigs (forget their name)

I even think theres an increasing marignal utility till the point that you can fully hit you enemy.
I never use more then 2 as you won't have any tank then -.-
I also use torps, those t2 long range ones work fine they also benefit more from target painters.
In pvp it's good for the whole group, not just for you.
If you paint a target, and someone tries to target him afterwards then he will target much faster as the targets size increased.

In pvp I kill a raven in a 10-20 seconds with my abaddon, i got 1.2k dps EM dmg so raven has no chance but in pve doing missions and stuff a raven is much better because of the shield tank.

PS: PVP: If you can fly an armageddon with T2 lasers, try to fit some heat sinks, tracking enhancers and long range ammo. ( +- 80km range )
I instapopped about 50 T2 frigs and cruisers are gone in 2-3 volleys.

PVE: Try to find the raven setup on battleclinic.com, it's pure awesomeness

this and it has a good tank and great dps

Raven is easiest to use in 4s.