First question...What are you going to use the bike for? Recreational riding, as in around the local park or "fitness trail"? Commuting? Fitness? Serious, long-distance road riding? Off-road?

What is your current state of experience and fitness?

What do you expect out of the bike? Just occasional fun jaunts with friends on a weekend, or more serious riding.....

The bikes you linked to seem to be a nicely-equipped mountain bike and a somewhat more relaxed "fitness" bike with a more upright posture.