Hi Jonathan, Welcome to Permies!
I'm not sure how much of a problem the mature roots are likely to be. I tried doing a search, but didn't come up with much. These two threads may be of interest:
https://permies.com/t/176609/Growing-veggies-fruit-trees#1387701
https://permies.com/t/8374/Permaculture-forested-land
The first talks about integrating fruit trees and veg and the second talk about productive gardening within established forests. It's a bit long, but there are some lovely examples.
I think the key for you will be to think about succession - how the plots might look in one year, 5 years, 10 years, 50 years. What maintenance would be required to achieve that, and what yields you could expect. I would draw out a plan for both plots and see which calls to you more. look at the edges and the connections to the rest of your land, sun rain water. How will these change with succession? Think about what you would do if they weren't a food forest - if one is more suitable for hugels, or annual crops for example.
I hope this helps. I'll add this thread to a few other forums to gain more eyes for you.
PS yes - pictures please!