Difference between 35 and 50 is not big enough IMO.
50 is my favorite, on any system.
For my Nikons I use 24mm additionally.
I must admit that I think it is often hard to use.
For me 28mm is the widest, though still relatively "normal", which I can use all the time for anything, just like your maximum zoomrange. Wider than that you enter into a different trade. You may or may not want that.
Also on a Leica, it is the widest lens I can use without an additional viewfinder, and that is a relevant factor for me.
So 28 it is for me, besides 50mm.