What your paying for in most high end rings is quality of machining and tight tolerances. Any of the top makers are going to be comparable. Some do throw in extras built in like, bubble levels or attachments for red dots and things like that. But unless you have very precise measuring equipment I doubt you could say one is better then the rest. They range in prices from ( ballpark figures) 100 for TPS rings, 150 for vortex precision ( made by seekins), 175 for nightforce or high end leupold, 200 ken farrel, 400 for spuhr rings. And many more in between. Is a rifle with sphur mounts going to shoot better with tps rings? Probably not. But they have more features and may hold up ubetter under the most extreme conditions.
Some have recommend burris signature z-rings. The reasons these come up is because they are a pretty unique system. They have a over bored ring size, that uses hard polymer inserts. The benefits of this is,1. it doesnt mark up your scope. 2 the inserts come in different thickness so you can use them get more elevation travel in your scope, better for long range. 3. If your mounting rail is not set true to your bore, you can use the inserts bring the scope true.
Iam the type of guys, how has to make every dollar count in any of my shooting rigs, I use TPS and Burris signature rings.
One final thing to keep in mind, some rings come in different heights so if you want a super low mounted scope, one brand may be the only one that will get you that close.
I have these on all my rifles with the exception of my Ruger 77VT that uses the proprietary "Ruger" rings
