Camera scanning results will depend on your gear and its settings. Gear matters!
In order to get the proper gear, you could take the approach backwards from your intended output.
- What is the max size I want to print from a single shot of a 35mm negative?
- How many shots will I have to stitch for a same quality print of a 120 or 4x5 negative?
Stitching can be difficult, specially if the lens has lots of distortions. You might want an app that can correct these distortions before stitching (or increase the number of shots which will make things more time consuming). Check out if the lens candidate is supported by the app in question.
Have a look at these:
and stuff you find on youtube like this
