My most used 35mm is my Leica MA by a pretty good margin.
My most used medium format camera is the Rolleflex but my Ikoflex II will likely pass it by the end of the year since I have found that it is easier for me to focus without using the magnifier.
My top cameras over the past few years are -
- Leica MA - 35mm
- Wanderlust Travelwide - 4x5
- Rolleiflex Automat - 120
- Zeiss Ikon Ikoflex - 120
- Pentax K1000 - 35mm
- Zeiss Ikon ZM - 35mm
I own far too many cameras and use all of them to some extent but none come anywhere close to the amount of use that these six cameras do.