The thing I love about MTB is that it's purely recreational. There is no need to get anywhere, whether it's a commute to work or a road workout. You see, with MTB, you can ride a trail and if you pass a certain obstacle, you just loop around and have a go at the obstacle. There is no where else to be .
Its also a lot quieter, no stupid wind and tyre roar coming from cars.
I don't ride my MTB much but when I do, its fun every single time. On the road bike, the rises are always good, but sometimes there are caveats .
Oh yeah, and bottom of the range hydraulic brakes kick top of the range road bike brakes.