[Handsome Creepy Eel]

I'd recommend Novi Sad because it's smaller, nice (in my opinion) and the atmosphere is bound to be more relaxed. You should have more value as a foreigner there too, even though it still has plenty of clubs (some infamous I think - there was a fire in one recently, and many people perished). It could also be cheaper.

The downside is that English levels are bound to be poorer, so if you don't speak Serbian (or similar Slavic language), you might find yourself unable to communicate.