I have been to Borovets once and did'nt enjoy it that much the drinking part was good but that was it. Since then I have been to Pamps 3 years running and this will be 4th time this year, That says it all really. Don't know much about Bansko. But I would recomend Pamps
It certainly is, you have got BJ's bar, Daks which will certainly keep you going, Daks bar will take you through until the early morning ie 6am. You have also got a bowling ally in Hotel Perlik for the kids