Road bike isn't ridden because roads suck too much
MTB is overkill for type of desired riding.
Desired rides would be in town and back roads as well as crushed stone trail.
Unsure if a gravel bike would be best even though it's designed for bad roads, gravel roads, etc.
What?
If there are too many options, pick a price range and see what's in stock at shoes near you in your size. Call em and go to places that have inventory in your price range and size. You will immediately narrow it to maybe 5 bikes just by calling.
A bike that can handle 38-45mm tires will work perfectly for you. They all have slightly different geometry and feel different as a result. Some will feel slow steering, others fast steering. There is no right or wrong, get what you like.
Buy 2x or 1x drivetrain. There are upsides and downsides to both. Again, no right or wrong. If you have a preference, then that helps further narrow the choices. If you don't care, then buy what fits best.