What are you scanning mostly? 110, 120, 135, large format?
Personally, I’ve scanned with a Canon 80D and a Canon 5DII, and both work fine (regarding your question about crop sensor or full-frame). However, it changes a lot which lens I prefer to use. Lately, I’m loving my 100mm macro (max magnification 1:1) which works better on the full-frame for 135 film. It gives me a reasonable distance between the negs and the camera to work with. When using a crop sensor, the camera should be placed a bit farther away, which your mounting setup may or may not be able to handle.
Have a look at the possible macro lenses that you would be willing to buy, then estimate at what distance your negative would be filling your sensor. See if this distance is something comfortable. Stay away from extension tubes or close-up lenses if possible since they amplify glare which in turn makes color corrections more troublesome.
I’m assuming you are not listing the file size in bytes, but instead in mega-pixels, right? For me, 20ish Mpx is good enough, I know that some films may deserve a bit more resolution, but i’m not too much of a pixel peeper. But since all your cameras are similar in resolution I wouldn’t worry too much about this.
In terms of dynamic range, here you may see some differences between the newer and the older sensors and the FF sensor may outperform the others. This is quite important since, sometimes you may run into posterization issues. However, I’ve never used the camera’s you list, maybe some other users have some experience here.