C'mon, this is like asking Hef to pick his favorite playmate.
I like OK, LOVE, Canons for their great glass and their dependability. I have several but if the shot really matters to me I'll take my T90 every time. Besides, I have too much money in FD lenses to change.
I will admit I'd like to have a Leica but I'd settle for a Canon 7 if I found a nice one. I don't currently have a working rangefinder.