Rats do good in wire cages. In tanks they become more prone to respiratory problems.

Ferret Nations are highly reccomended but also very expensive and the bar spacing is apparently easy for young rats/small females to get out of.

The first SP cage you posted can hold ten rats. It is the cage that I wanted but the store hadn't carried it when I went to buy a cage. I instead got the second one that you posted. It can hold 6 rats. If you have young rats then they can slip out. I find it easy to clean and I like it alot. My rats also like it. On a scale from 1-10 I would say 9.5!

Good luck!