Mine is IR. That isn’t my exact sauna. Mine just looks exactly like it. I don’t have a wet steam option.
I do see that the wet steam ones are much cheaper than the IR heated ones. (I haven’t looked at these things in two years since we bought ours.)
My only thought is that it should be very comfortable and enjoyable to sit in. The one you linked to has the same crappy chair as I have in mine. It’s not fun. I’d want to make sure that you could put a bigger, more comfortable chair inside. I can’t do that with mine since it’s so small.
My other concern would be cleaning. How do you keep a steam sauna from growing mold and whatever inside?