What bike is best will largely depend on the type of riding you are likely to do. Will it be mostly road? Dirt Tracks? Off-road?

Also, how often and how far do you intend to ride?

Generally speaking, the best thing to do when choosing a bike is to find a Local Bike Shop (LBS) that stocks the bike(s) you're interested in, so you can try them,both in terms of general handling and fit.

Finally, what's your budget? If you are planning to spend a decent amount of time on the bike, it would be worth seeing if you can stretch the budget upward a bit. The quality of the components will increase with the price. As it is, I would be looking for the more expensive one(s) of the bikes you mention.