A few comments on posts above:
To date, our mat has not left scuff marks. We worried about that, and also the possibility of a shadow transfer from the black rubber, as the wet bath enclosure is porous in fine scale, especially where it was eroded by gritty shoes. If you've ever, for instance, set a container of colored liquid soap on a cheap plastic countertop and the soap dripped... what do they call that plastic substance from which they make builder-grade countertops... "faux marble" or "cultured marble" something... that stuff will stain from a wide variety of substances that come in contact with it, and it's a similar formulation to the overlay on the fiberglass wet bath. So we worried about that with the wet bath as well, but so far no problems have manifested. If we are storing the van for a prolonged period, especially during the hot summer months, we remove the wet bath mat "just in case" and we store it on top of the galley counter, which itself is covered by a piece of fitted shelf liner to protect it.
I did not go with the spaghetti mat despite preferring the appearance of it because I was afraid it would be too light and would slide around too much, thus exacerbating the grit / erosion issue on the wet bath floor. The restaurant-grade mat that I used is HEAVY. The sheer weight of it plus the fact that it's cut to fit the wet bath exactly means that it does not scoot around in the slightest.
Teak of course is very popular but I was turned off by the price. We could have built a teak mat ourselves, but we have had so many other projects going on with our Class B that I simply did not want to apportion my / our time that way. I got the restaurant mat, templated my wet bath floor using butcher paper, and then cut and installed the mat... the entire process probably took 2 or 3 hours, including research on where to buy a very heavy restaurant mat without paying an arm and a leg.