Having used several (Exakta, Exa, Nikon F, F2, Rolleiflex 3003, Praktina, various Practikas... - just as far as 35mm is concerned), I'd say that the best quality is the Exa/Exakta (at least with the older magnifyinging/condenser WLFs), while the most convenient is the Rolleiflex SL 2000 / 3003 (switchable between WLF and eye level finder in a fraction of a second).