Unless otherwise noted, please assume I am talking about DX:
San Marino (also called Sannys) bottom row of the photo
Pretty much all the new Rhynos that I've seen on the shelves are Sannys. I have asked a couple online shops as well and all of their new ones are Sannys.
These seem to be the straightest to me. Decent HSS, not as much fade, more glide than I prefer. Like a broken in Ontario. Champ Sannys are more HSS, more fade, less glide and closer to a new Ontario. Sorry, never thrown any Star/R-Pro/SE Sannys.
Ontario top row of the photo
Flat, beefy HSS, good fade, no glide. IMO this is what San Marinos want to be when they grow up. Ontarios were the first Rhynos I threw and I fell in love with them. The bar stamp textured LEs were my go-to putter for years when I was playing 7-ish rounds a week. When SEs started to get hard to find I switched over to DX. I love DX Ontarios for the reasons I first mentioned in this section. Plus I started to prefer firmer putters for several reasons. The clear pearly Champ is an over stable, glideless, Wind resistant thing of beauty. This is exactly what I wanted a Champ Rhyno to be. The R-Pro was... meh. Too floppy for my tastes now but I would have loved it when I first started. Still decently over stable but not like a Champ. The top of mine is still the flattest Rhyno I own but my friends' R-Pros all started to warp and clover. Not bad but not my cup of tea. DX Ontarios are my favorite overall Rhyno and the Ontario Champ is my favorite wrecking-ball for overstable needs, crashing through underbrush, or get out of trouble shots. I'm disappointed that they are getting harder to find. Sorry, never thrown any Star or R-Pro Ontarios.
Rancho Cucamonga middle row of the photo
Not bad. Halfway in between Ontarios and Sannys. I'd rather have these than Sannys. I can't tell too much of a difference but Ranchos are slightly less beefy than the Ontarios.The pink and white skull disc (reminds me of the Brain from Animaniacs) is my main thrower right now and she definitely gets the job done; I throw her into winds like an Ontario and don't think twice about it. Can't say the same about Sannys. I definitely hold back a smidge on Sannys. There are a few Rancho bar stamp SEs in the photo (they are stacked up, I think there are 2 whites and a yellow under the top white one) and they are not textured like the Ontario SEs, they feel really smooth like R-Pro. I was running out of Ontario SEs and I found a stash of Rancho SEs so I bought them up. I didn't know about the different toolings back then and these Rancho SEs are what clued me in; it turns out I don't like the Rancho SEs nearly as much. More because of the texture and stiffness rather than the stability. Again, they are fine if you like floppier discs but that's not me, not even in the winter. Sorry, never thrown any Star Ranchos.
After reviewing this info, it is apparent to me that I need to try a Star Rhyno
And maybe some of the ProShop stiff Rhynos!