If this is the Yitahome cage you're thinking about, I'd say the single unit Critter Nation would be better.
The Yitahome cage is much smaller than the double unit Critter Nation. It has a metal grated floor, it doesn't have full size double doors, and the bar spacing is wide enough that young rats and even smaller adult females will be able to escape.
If $200 is your budget, definitely go with the single unit Critter Nation. It's great for up to 4 or 5 rats. You can always upgrade later with the add-on unit.