Those are two very low, low end bikes. If I had no other choice other then these two then I would pick the Gravity C due to the better shifters. I have rode downtube shifters and I don't like them at all. I think you would be better off checking Craigslist and looking for a used bike. Both bikes are going to be heavy and it really doesn't matter for the other stuff you asked about. Do you have any idea what size you would ride? Buying online is tough if you have never been fit to a bike before.