There are huge differences between riding road bikes and riding mountain bikes. I agree with all the advice you have had so far.
I couldn't make up my mind which kind of biking I liked best, so I have 2 bikes. I ride my mountain bike when I want the quiet and peace of off-road trails and don't mind LOTS of climbing.
(Our terrain here is VERY rolling and hilly)
I ride my road bike when I want to go fast and traffic levels are low, since our local drivers can be impatient and a bit hostile to bikes on the road.
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