Even though they haven't really been in style since the 2000-2010 timeframe, it's pretty damn hard to beat the oldschool Badger steel rings for durability IMO.
Sure they can get rusty if you don't take care of them, and they're heavy... but they are absolute tanks. I can't say I've ever seen one fail.
I have however seen them crush the crap out of a scope tube though when they were overtightened by someone who didn't know when to stop... lol
Regarding Spuhr, I've had 5 clamp bars crack between 11 Sphurs over 12 years or so of use. I see they're now including steel clamp bars on their newest Gen 3 models (they may have finally solved the clamp bar issue with the material change, which is something that was suggested to them several years back) but every now and then you still see new pictures and reports of cracked Spuhr ring caps, and their use of countersunk screws on the ring caps is problematic from a design standpoint. Also quite a few complaints that it's easy to strip the screw heads. Still see a lot of them though because they look pretty cool, they are available in a lot of diameter/height/cant combos, the 45 degree ring seam makes for a very low profile on the top and side so it's easy to read your turrets, and there are a lot of accessories made for them. I won't use any more though based on the problems I kept having with them over the years.
Plenty of other good mounts and rings that don't have a history of cracking like Spuhr-- Nightforce, Seekins, Badger, ARC, A419, Near, Geissele, MPA, Griffin, ERA-Tac, Reptilia, MDT, Hawkins, etc. I'm sure there's more I missed.
Right now I'm partial to ARC, Badger C1, and Hawkins. After my 5th Spuhr clamp bar cracked a few years ago I sold them all and switched brands. Right now I have 10 ARC mounts, 1 set of ARC rings, 4 Badger C1 mounts, and 2 sets of Hawkins Ultralight Tac rings that have been in service for the last 4 years or so with zero issues.