For me it's a complex thing. I used to shot only B&W with my Zorki 4 or my Yashica FX-2. Now that film has become scarce and its cost way too high, my father gave me a present, a Pentax K100D super, so now I have the opportunity to try shots in both ways...
Nevertheless, I've found that it is quite difficult to make an absolute decision. Each scene on its own has its defined character (and the beauty is on the eye of the beholder
🙂 ). The problem is to see it I think.
For example, for me, this image loos certainly good in B&W:
But this portrait that I took of the girl sitting on the next table at that bar, loses all it's "life" in B&W.
So, I've come to find that each scene has its own character, and while on the street, you can find any. However, if I would have to make a decission, I'd go for B&W.
Best,
Bas.