SSDC ! As mentioned, traffic is lighter and easier to pass and
navigate.
Thou I passed at BBDC years back, you really need to depend on the
traffic at BBDC, which will determine how challenging (lots of
heavy vehicles and taxis) it would be on tp day.
Heard UBI is tougher, and heard there is a test route that needs
good judgement to cross thru the traffic junction.
It really doesn't matter where u pass, ultimately, you still need
lots of practice to perfect driving skills.