Not so fast! I dont think its THAT simple at all.
Having had both, I sold Leica M6 and have Bessa R3M.
Why? - Leica has several things that bug me - Curtain that can have pin holes or burnt, Terrible, to the point of being unusable flary VF patch - fix costs almost as much as used bessa. Bottom loading - Ok - you can get used to it, but it still is not as easy as a swing door. For the price of USED M6 you will get 2 NEW Bessas and for the price of CLA and flare fix - you can get another Bessa. IMO m6 is not all that. But if you HAVE TO HAVE Leica - well - get Leica.
Does Bessa have faults? Sure - louder shutter, smaller/shorter RF base (but you have 1:1 VF to compensate). BTW - Bessa is fairly solid made. I have had several Bessas - R, R2M, R3M and I never had any problems with them. Had 4 Leicas and 3 of them needed CLAs and repairs, while costing more than any Bessa to begin with.
YMMV.
