My first cages were martin's cages. The wire platforms never gave them any problems.
Basically, the devil is in the details (which seems to be my favorite phrase lately).
If the floor surfaces are completely grill type configuration then that is more uncomfortable than the grid/mesh style flooring. I would also avoid galvanized cages because they absorb urine smells and deteriorate faster and are harder to clean. Instead, make sure you get powder coated. The cage will last 2 years longer easily.
If the wire is not cleaned regularly, the foot pad pressure combined with unsanitary conditions is a perfect breeding ground for bumble foot.
If the cage is completely wire, including the base pan, with no way for them to get on a more comfortable surface, then that is a complete no no.
For a solid plastic platform of the super exotic cage? They are pee and urine traps which causes your little rat to marinate in their own waste, also a perfect breeding ground for bumble foot...more so in some ways because their feet are always in it. Not to mention the occasional chewing. You also have a harder time attaching hammocks and such than you would with wire shelves.
Apples for apples, all of the cleaning and comfort concerns about both can be solved with adding felt liners pinned or clamped onto the ramps. The felt absorbs liquid waste and makes clean up simpler.
Even if did get a martin's and you don't choose to cover the mesh shelf levels, regular cleanings will prevent any health issues, and lots of hammocks will give them plenty of comfy surfaces on which to move. Don't forget that the floor level is solid as well, so they have that entire surface on which to walk.
A large number of rat owners have martin's cages and love them, and since your only concern is comfort, it really depends on how much money and time you want to invest in felt liners and/or cleaning.