Quality-wise, these bikes look like they're pretty much exactly the same level.

If you get a chance to test ride them both, pick the one that 1) fits best 2) is in better shape 3) appeals to your eye the most.

At $200 each, they are decent values, but not screaming deals in your market. Consider the expense of having to buy new tires, taking it in for tune-up, etc. If one needs work and the other is ready-to-ride, it makes your choice easier.

The Centurion looks like it has a larger cog set on the freewheel, so if you're riding any hills, it'd be a lot easier pedaling on the hard climbs. It also has an ugly, smushy saddle which you may or may not like, depending on your level of fitness and riding style.