Whats better pa120.2 or something like mcr320?

what would be better, a thermochill pa120.2 or a triple radiator from swiftech or black ice?

A MCR320.
A triple radiator from Swiftech.

The triple rad will beat the dual rad. But that's not a fair comparison.

Depends... for space restrictions I'd take the PA. For example, if you have a smaller case that can only fit a 2x120mm rad internally and a 3x12mm externally, then I'd get the PA. A PA 120.2 would some good fans and a shroud will almost compete enough with the MCR 320 if you don't have the space.