it really depends on what you wanna achieve, with tradeoffs.

personally i use aio on cpu because i think it's quieter, easier to install, give me more space to swap stuff (air coolers are bulky), and it's relatively cheaper than custom wc. (the bonus is aesthetic look hehe)

i also use aio to cool gpu. it's much more efficient without making noise, and i use the same aio and gpu bracket for different generations of gpu. (cheap; it's poor man's gpu cooling lol)

will go for custom wc when i have time. plan to put rads outside and away from the rig. it will take up more space but i think it's much better than cranking these hot stuff inside the rig, having less parts that leak inside the rig, interfering air flow and all.

i guess so. lemme save some extras first lol