| From reading what you wrote, I think you may want to work more on your gear shifts than worrying about whether you get a mountain or hybrid bike. While I agree that rolling is slower with a mountain bike, faster with a hybrid, and definitely fastest with a road bike, if you start in a low gear (and stop at lights in a low gear), you'll have a much easier ride no matter which bike type you go with.
If there won't be many sand traps or dirt roads, as you stated, the hybrid would be a better fit.
Negotiating sand is a matter of developing the skill set, but the simplest solution is to look at least 15 feet ahead, change your gears early, according to the upcoming terrain, and have as little bike lean as possible when negotiating turns and questionable terrain.
Hope this helps!
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