As recommended above shoot the Fuji 6x7 for a month or two and see how you like it.
If you don't like it then sell and figure that any money you lose was a cheap rental fee.
I have done this with both medium format and large format cameras and lenses. If I think I will like something better than what I have then I buy it at a good price if I can afford it (no Mamiya 7's or Ebony 4x5's ). I'll compare both cameras and keep the one I like the best. Sometimes I lose a little bit of money but it's worth it for the knowledge and fun shooting something different.