Look Mr dont compare the fields in terms of money, you cant earn beyond that what ALLAH has written for u. No matter what u will do and how u will do!!
To me u are looking like a greedy person:-# But remember RIZQ is not associated with these type of things, so take it as a Necessity not a Goal Buddy!
Nevertheless Go for the BBA/MBA side if u wanna do ur own business in future. On the other hand if u opt for a job then remember this field looks very charming from outside but once u get onto a chair then u have to tackle the Gray Market, Tricks and Trims, Betrays and false stories creation, white/black type things, on every day basis, in most of the jobs under this tag. U will have no real HUNAR in ur hand (in contrast of a motor mechanic or an Engineering field Guy which can earn his Rozee above all that!)
Banking Job involves 'SOOD'. Choice is urs. (It all depends upon ur internal satisfaction, but i m afraid that u think only in terms of money!!)
Anyways if u still interested then go for 2 years Grad + MBA from Lums, IBA coz BBA is nothing in the market (Wastage of time).
I will recommend the Engineering Side (Computer/Telecom, Electronics). It requires much less time n effort as compare to BBA/MBA road. In this u have a HUNAR in ur hand and u have not to compromise in b/w internal satisfaction and job retention. Plus its a very broad field having so many options right after completing ur studies.
