Road bike or mountain bike?

I'll be riding along concrete trails a lot, but I also want to be able to ride in my backyard which is rather hilly. I get tired easily so I need something easy, but I don't want it easy enough and "loose" enough to go every whichaway when I decided to ride through rocky and rough terrain. so... show more I'll be riding along concrete trails a lot, but I also want to be able to ride in my backyard which is rather hilly. I get tired easily so I need something easy, but I don't want it easy enough and "loose" enough to go every whichaway when I decided to ride through rocky and rough terrain.

so which would work, road bike or mountain bike?
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