For 35mm,
Leicaflex SL -- magical mix of micro prisms create almost a 3-d effect. Heavy but great lenses. High mag. viewfinder with good eye relief.
Leica M3 -- Viewfinder big and contrasty. Great, overpriced lenses, but plenty of third party stuff in native M mount or via adapters.
Nikon S2 -- 1:1 contrasty viewfinder, small, compact, light dimensions. Plus inherent reliability, once serviced.
Zeiss Ikon Contax II -- for history, and always surprised by the quality of pre-war Sonnars. Plus the long base, massive and contrasty rangefinder patch is unique. And who doesn't love the bokeh of Zeiss Sonnars?
Honorable mention: Canon FTB, Canon L1
Dislikes: All cameras are capable to taking great pictures, but I've had lots of cameras come and go through the house in the past decades. The Contarex Bullseye was a beast when I acquired it, remained a beast as I put film through it, and a beast when I sold it. Recently sold a Nikon S3 because the rangefinder patch was too vague for my taste. Never been a big fan of Nikon F series SLRs either (F, F3), because their viewfinder magnification is less then a Leicaflex. Never bonded with the 0.72 Leicas and I tried for many years (M4, M5, M6, M7, MP); plus way over priced for my pedestrian photos. Topcon R was too quirky, though good lenses, but I liked the original Canonflex SLR until I found out the lenses were slightly radioactive. Didn't like the aperture priority of the R7 (or F3), plus viewfinder wasn't as good as the Leicaflex. Contax D was a very cool SLR camera, with that whirling disc, but scratch my eyeglasses and somewhat archaic. The FM series of the Nikons had too squinty of a viewfinder, as did the post war Contax rangefinders. Leica R6 was ok, but nothing special. Leicaflex SL2, inherent unreliability at higher shutter speeds resulting in blanks. Others too.