What sort of nightlife and what sort of budget? How old are you?
Ibiza is popular and its lovely even if you don't like clubbing but not everyone likes that sort of club and its expensive.
Tbh, I think we're sometimes too hung up on finding 'the best' especially when using other people's preferences. If its a solo holiday you're looking to book for this summer, I'd start by looking at where you can get a sensibly priced flight when you want to go to somewhere that's the sort of place you know you like.