I currently have a Corsair H100i Pro XT AIO inside my Lian Li A4 H2O ITX case. I don't really like how loud my fans are blowing and I'm thinking of going either liquid cool or air cooled with Noctua fans. I want something as quiet as possible and good at cooling as possible. Any suggestions?
Personally, I'd choose air cool. I have zero confidence about my DIY skills and I want to keep my PC simple.
As you mentioned
as quiet as possible
How much cost are you willing to pay? Bot only money, but also the time you'll spend on it. If you really love digging into it, then I'll suggest go ahead for liquid with caution.