No comparison at this point in time, and probably won't ever be....IPL, simply too big, too much money, too much coverage, too much everything basically.
But the BPL has a real chance to be an alternative for many players(players that have national team commitments during the IPL tournaments), players not being considered for the IPL(Pakistani players), and players in general who have been overlooked.
In this case, being a lesser IPL might just be the ticket to sustainability. Pakistan is a no-go, SL are broke....I just hope the people in charge don't mess this up, we mess up everything good