really, all depends on how often you turn them if it's a valve that MAYBE once a year you turn to do maintenance on your return, go with the cheaper American Standard brand from lowes. if it something you need to adjust alot spend a bit more and get a good valve like a cepex. whatever you do, be sure it is true union valve so you can take it apart and not worry about shutting down your system.
also, if it's fine tuning you need to do such as for a bean animal or reactors get a gate valve and not a ball. true union again.
ohh, get them threaded not slip. easier to reuse them latsr.
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