I guess you havent been there recently, Skopje has been reconstructed and renovated a lot in the last couple of years, the pollution is there but the city, especially downtown is very nice for the standards in the balkan...And among those 3 bases, its probably the base with the most happy crew and atmosphere. OTP might be good for chicks, but if you dont fancy to go to work every day, its a no go...CLJ is very nice for partying, very good clubs. If your into clubbing go to CLUJ.