The best advice I can give you is go to the local bike shop and try some bikes out. Make sure you ahve a budget, but try all sorts of bikes, mountain, hybrid, road and at all prices. You will spend a lot of time doing this so make sure you don't succumb to the sales pressure but ride as many bikes as you can.
For me, its a roadbike for sure. I'm really not a fan of riding mountain bikes for a commute and don't get me started on hybrids. I love the roadbike geometry. I have two types of roadbike - a roadbike for racing etc and a cyclocross bike for commuting. These are NOT to be confused with hybrid bikes - these boys are roadbikes that can go off-road with wider knobby tires etc.
For my DW, it's a mountain bike all the way. She likes being more upright and prefers the slower speeds and the wider tires.
You'll soon figure out what's best for you. If you're doing predominantly road riding then I'd suggest a roadbike but you may not like the fit or something. As far as brands go, I'd find myself hard pressed to recommend anything as everyone's different. I love my Fuji roadbikes - in contrast, I've tried hard but don't get on with any of the Giant ones...
Saying all that, you'll know which bike is for you the minute you get on it. Seriously.
In God we trust, all others bring data.
- W. Edwards Demings
If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise.
Specificity, specificity, specificity.
The plural of "anecdote" is not "data".
- Frank Kotsonis
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