Hi Brad...I would discount the buildup of polymers on the surface from either wash (as noted above). In full disclosure I haven't used the Optimum Car Wash even though I have a quart of it...because I'm still using up conventional wash that I bought back when you were an active moderator on Autopia...and because I've largely switched to rinseless just to cut down on time and work. I don't know of any way to Master Blast a rinseless and get a good result, so if you're more comfortable with a conventional wash, go that way.
Another thing to think about if you're skittish about the drying process, is that most rinseless washes today contain "wax" so you might want to try ONRWW which will give you a little more lube when you're drying (although I don't remember it being noticeably different), but it does tend to streak more than ONR.
I haven't been able to like the blue waffle sponge that I bought and I'm too cheap to buy a BRS or BGS; my favorite wash media for rinseless is some old Meg's QD sponges circa 2004 (remember them?). After you wash them a number of times the sponge breaks down and they are pretty flat. I guess the closest available equivalent is a MF mitt.
There are countless threads and methods for rinseless to address some of the concerns you have, with endless permutations of prewashes, buckets, grit guards, media. As The Guz noted...maybe different approaches for different situations, depending on the car (DD vs. garage queen), amount/kind of dirt, etc.