For me it's not a question of "inferior" - there are good curry gravies, bad curry gravies, and indifferent curry gravies. From time to time, there are even stunningly superb curry gravies. But as a lover and cooker of traditional 'from scratch' Indian food I fully appreciate what chilli chopper is saying.
Personally, I'm passionate about both (all) styles, though I'd say my cooking at the moment is split 70-30 in favour of BIR.
That said, I have just added 'Prashad: Cooking With Indian Masters' to my collective.
(I may have to stay away from this forum for a while. It's costing me a bloody fortune! ;D )