Welcome here..
Imho Shooting a leica or a 5d is still digital..still full frame and it doesnt really make much changes in terms of the picture outcome...i bet u will know more given that you tried both cameras
But the shooting experience is different, the feel is different and the kind of attention it gets is different..
Try pointing a 5d w a 70-200mm lens vs a m9 w a 100mm lens at a person..ppl feel less intimidated..which explains why its good for streets. But then again, Danny Santos is again not using a M..
You can always pick a film M or slr to try on film..its definitely different vs shooting digital n u urself can decide if film or digital is better for u..i have friends who swear by digital..
Enjoy shooting