Thanks again to all for your input. After more thought, I will stick with Nikon. I have 10 mf Nikkors, so will stay on this horse.
Be aware that Nikkor Pre-AI lenses (1959-1977) not fitting at all on 95% of Nikon cameras made since the 80s: FE2, FM2, FA, FG, EM, N2002, N8008, F90, F100 and the list goes on and on
Also take in mind that the latest Nikkor lenses, the ones with the latest optical formulas, will not work at all with all the classic cameras: Nikon F, F2, F3, Nikkormats (all models), FE, FE2, FM, FM2, FM3, FA, FG, the list goes on and on. Because such lenses lack an aperture ring.
Finally, no other lenses can be adapted to work well with a Nikon body. Unlike a Canon EOS body, which will accept M42, Nikon, Pentax K, Leica R, Yashica C/Y, and other lenses with adapters that don't degrade image quality.