Home routes when I lived in Flatbush: B6, B11, B41, B44, B49, B68, B103, Q35, BM1 - 4.
Home routes today: B6, B17, B42, B82, B60, B103 and BM2.
As for rarest catch: Catching an Orion V on the Q35 when it was still Green Lines, catching a Orion V on the Q35 a couple of years after the takeover.
RTS on the B8 in 2012
Hybrid on the B103 in the C40LF era
Prevost demo bus at CAS depot
NG on the B41 when FLA first got those buses in 08
Matter of fact I caught NGs at many depots when they first got them, not really excited about that as I preferred the buses the NGs replaced and still do (Except for the 400 & 500 Orion V, those were pure garbage)
Catching Orion V CNG 581 - 610 at JG, they was kinda rare as they there was only 30 of them at Gleason, also they predate the bustime era.
Catching the first 2200 MCI SC got on its first day of service.