For most medium format folders, I regard them as not being very useful wide open, unless you're going for a shot where lens aberration is adding to it.
I have an f/3.5 and f/4.5 medium format folder. I use the f/3.5 at f/8 or darker. The f/4.5 gets used at f/11 or darker. That is when each lens is suitably sharp for landscape work.
If I use them at brighter apertures, they resolve less detail than my 35mm cameras. Although it gives a distinctive look.
I'd go with the one in better condition - make very sure to look carefully at the lens in relation to the film plane to see if it is parallel. That's extremely important with old folders, it makes or breaks them.