This is a bit of a painful question... but here it is (taking my wife's and my accordions together)
We have a 26 key 40 bass 2 reed Crucianelli that is about 55 years old. It is in perfect working condition (after I did a complete overhaul a few years ago).
We have a junk 37 key 80 bass 3 reed Bianco Freres that someone gave to me for parts but it was too good for that so I got it working again.
We also have a Hohner Verdi V in good working condition. My wife used it a lot to play for people with dementia.
That's it for our PA's. We used to have more but then switched to CBA.
We have a Bugari 508/ARS/C, 46 notes 4 reeds, 55 on melody bass, cassotto... a nice instrument, and my wife loves the size.
We have a Bugari 540/ARS/C, 52 notes 4 reeds, 49 on melody bass, cassotto... a very nice instrument I bought on a whim at an on-line auction (for a killer price). My wife plays it in ensemble and orchestra.
We have a Hohner Morino Artiste XS, 56 notes 5 reeds, 58 on melody bass, cassotto... a very nice instrument but heavy.
Our latest acquisition is the AKKO Bayan "super de luxe", 64 notes 4 reeds, 58 on melody bass, cassotto... a superb instrument, and currently my workhorse.
Finally we have a Pigini C39 bass accordion, 40 notes (C to Es), 3 reeds, with registers.
So... a total of 8 accordions, 6 different brands...
Which one do we like best? Well... the PA's are just low-end instruments from days gone by, but the CBAs we all like a lot, for different reasons.