1) Olympus OM-4T. My favorite 35mm camera, I have had one since 1994. Tiny, light, incredible metering system (the only camera I have ever owned that I didn't use a handheld meter with), and wonderful lenses.
Though I have owned a couple of Leicas, looking through my work, most of my best 35mm work was done with the Olympus system.
2) Kodak DCS 14N. An early fullframe digital camera, 14mp, used Nikon lenses. A deeply flawed camera that was unusable above the base ISO of 80 and gave terrible image quality with long exposures. Yet, when used in the right conditions, it gave the most incredible color of any digital camera I have ever used.
The Kodak 14N files also converted to black and white better than any digital camera files I have worked with!
3) Mamiya 6. The modern interchangeable lens Mamiya 6, not the old 1950s folder. I have always loved square format, and shot Hasselblad for years. With my health problems, I couldn't carry the Hasselblad anymore, and sold it for the Mamiya 6.
The Mamiya is so lightweight and compact, I can carry the camera and all three lenses that were made for the system in a small messenger bag, along with a meter and film, and I can do so all day without getting tired and without pain. I could even handhold it!
The lenses are incredibly sharp; I sacrificed nothing in ditching the Hasselblad.
I don't have a 4th and 5th to add. I haven't owned many cameras in my lifetime, and these are my favorites. I currently shoot all my color work with a Canon 5DmkII. It is a great camera, but there's nothing 'special' about it.