I know that aios have a shorter lifespan than air cooler because the liquid will naturally evaporate but they have better performance.
Not necessarily. The reason they die is because the pumps in most AIOs are of relatively low quality and they're not serviceable. Evaporation doesn't help but it it doesn't actually kill anything unless the air bubbles get stuck in the pump.
Plus, only 280mm/360mm AIOs actually perform better than good air coolers. A dual tower air cooler and a 240mm AIO will perform pretty much identically.
28 minutes ago, Destroyer94 said:
would you recommend an aio over an air cooler like the one in the second build that I included?
I've always prioritized reliability, performance, and price over aesthetics. Personally, I'd go for an air cooler. It's cheaper, they'll last forever (not kidding, I've got air coolers in my house that are 15 years old that still work as well as the day they were manufactured, so you can carry it forward throughout your builds for a while), and they'll perform just as well as a 240mm AIO. I would probably go for the lower priced Peerless Assassin I recommended since it's 90% the performance of the NH-D15 but for less than half the cost, it's a really good value cooler, though if you just want the name "Noctua" that's fine too.