i always used air coolers.
1)way less moving parts.
4)if something does break its often way less costly to fix.
5)i find liquid coolers aesthetically ugly unless your spending real money on ptg/glass tubing.
i do see the advantages of liquid cooling but saying as i build most of the time for other people who dont have a clue about pc's. i just find it way less of a headache to use air.