This is so dependent on where you live, what your friends are into and what you have access to/what the roads are like for traffic around you. If I lived where I used to (mid-wales) then I quite easily could've ended up MTB'ing and CX'ing. But where I am now, although there's lots of that around, it's just as easy to be a road rider. For me the social side and commuting is important, which is road.
I generally find on road set myself more challenges (generally climbs and routes for me). So more social. Costs far less. And I would say it gives me more fitness.
Number of times I've ridden on the road in the last 5 years: 23,000+. Number of times clipped by cars: 4? 5? Number of times crashed not involved with another vehicle: 3. Number of times with any injury: 2.
Number of times I've ridden offroad the last 5 years: 4. Number of times injured: 3. No vehicles involved.
LOL I'll stick to road thanks. It's far safer!
Bike parks my mates ride are boring for scenery - just trees and loads of people, generally in the way. As a mediocre punchy road rider, I can out-climb all of my MTB buddies on trails and have far more stamina. Although most of them are eMTB riders now so a little harder to keep up with them. I really need to do more MTB as get quite a lot of bike skills from it you miss as a road rider, so that aspect of it I'd say MTB is more skilled. I probably need to ride easier stuff as well, to get injured less doing so!