Have a Roo 233S. If you have the need for three bunks, you'll probably have the need for the additional space of the deeper slide. If you don't need it you'll likely still appreciate it. Can't speak to the kitchen vs that of the others because I'm not familiar with them. The 233S does lack for counter space but I imagine they all would.
Overall very happy with this unit.
On edit:
Just googled the solaire 213X. It may have a couple of inches of counter space between stove and sink. Looks to have more upper cabinet space due to TV location. But the Roo has a full height pantry where solaire has none. The front bunk requires climbing over a bench in the Solaire. In the Roo none of the bunks require climbing over anything.