Just to bring a challenge into the discussion. An older folder with a simple f3.5 triplet vs a 35mm SLR with a 50 1.8 double gauss, the optical difference might mean that aside of tonality, the MF may not have that much if an advantage. Put T grain film into the 35mm and there are 1-2 stops of wider aperture, and the format can kick some punch.
My Voigtlander Rollfilmkamera and my Wirgin Auta (both 105mm f/4.5) are both lighter than any of my M42 bodies with 50mm f/1.4 Super Takumar mounted, and both cameras have a history of producing high quality images. Not sure a 6x9 shot with a triplet (even at f/8 to f/11) is any
better than a 35mm with fine grain, high sharpness film (like, say, CMS 20 II) -- though I can shoot hand held at f/11 on ISO 400 and get images about as good as what the Super Takumar can make on ISO 20 super-fine film (and Fomapan 400 doesn't need special developer to do its best). IOW, medium format gives me, on fast film, what 35mm can just about do on slow film, and doesn't weigh any more if I use a folder.
Then again, 8 frames on a roll of 120 isn't cheap to use -- at film cost only, that's just over fifty cents a frame, with the cheapest film available (almost double that with top-end Kodak, Ilford, or Fuji).
That's one reason my Wirgin Auta usually has the masks in, giving 16 on a roll instead of 8. My Daiichi Zenobia is an even better choice for 6x4.5 (significantly smaller/lighter), or will be again once I get the everready case restitched -- the camera has no strap lugs, so it's fully dependent on the case.
One telling point: even though my Kiev 4 is the camera I carry every day (because of size/weight even with three lenses and some filters), that and my Rollei 35 are the only 35mm I've shot since resuming film photography a few months ago -- and if/when the next stimulus check comes out, I'll be shopping for an actual Contax II or IIa, to have a repairable/serviceable body that can use the lenses I already have for this system.
However, I'll also be shopping for a Mamiya M645 1000s, an MF SLR that won't wear me out to carry. That, I could take to work (since my Kiev already goes on lunches and breaks with me, only the bag with extra lenses stays at my desk).