Many thanks @dfcorona,
I just told the store to go for the Noctua as I feel more comfortable with a regular Heat Fan & Sink rather than an AIO (I've never used one): I feel it's just safer, in the sense that the only point of failure is the fans, but it's an easy fix if one of them fails.
Whereas with an AIO, if the pump fails, you run into much bigger troubles, especially if you're on an urgent job and you're close to the deadline. The only solution I can think of in that case is having a spare AIO just for that particular circumstance, which comes with a cost, plus it's not super easy to replace, at least less easy and more expensive than just replacing a defective fan in the case of regular Heat Fan & Sink cooler.
That being said, I definitely want to enable PBO to maximize the rendering power of my cpu so, not sure if the Noctua will be able to cool it down sufficiently or not ... I will keep you updated :)
Thanks again