First, just want to note that “best value” might be subjective. I understand what you’re asking though. What works well for YOU is where you try to get to—and may become your best value. I hope you will find that place relatively easily! My journey includes owning/returning the following:
XVive U4 ($250). Started with this and gigged with them for a couple years. Are they “the best”? Probably not. Still, surprisingly less hissing noise than some of the more expensive units. Are they subject to interference? Depends. I gig in clubs ~300-500 people, some more cramped than others and have never had any dropouts. I was outright scolded by a sales representative and got the “you’ve been warned” speech by the same on more than one occasion when buying a second unit for our band (“It will never work and you will be sorry”). We now have two identical XVive U4s in our setup (on different channels)—and still no issues. Just ran a 10’ XLR away from the other. I understand that we may be getting lucky. As an entry point for IEM, it’s relatively budget friendly—but by no means top of the line, and maybe it won’t work with more (i.e. 500-1000) WiFi users around.
Galaxy Audio ASD700 ($250). Tried this for the simplicity of plug/play on UHF. Horrible to my ears. Returned.
Galaxy Audio AS1200 P4 ($400). Just super noisy (again, to me) for the money. Returned.
Shure PSM300 ($800). I found it to be noisy for the price, yet some will swear by its high quality—and use them in all different types of situations. I believe them! But they weren’t for me. Returned.
Audio Technica ATW3255 ($850). It was okay, but for the price, I was expecting higher quality. Like the others, a persistent hissing noise. Not the quality I was willing to pay that much for. Returned.
Sennheiser G4 ($900). I recently upgraded to this—and this is where I’m at today. I couldn’t be happier! Like, no noise. Clean, clear. Easy setup. I switched from the XViveU4 for several reasons. 1. Wanted something higher quality. 2. We added a vocalist who is coming in at entry level—and wanted the XVive because of the price point. 3. It was an opportunity for me to move out of the WiFi frequencies as well as into stereo monitoring. 4. Had disposable income from playing out—yay!
One thing I learned is that everyone’s ears/hearing is different and subjective—Where I might hear hiss, others don’t. Where some have interference issues, others don’t. What some find simple, others find cumbersome. So what system is “ best value” for one, may be “worst” for the next. I suggest trying several systems in your price comfort zone—because they aren’t all the same—but YOU will learn what is acceptable and what isn’t—for you.
A second thing I’ve learned with IEM is that the seal of the earbuds themselves—into your ears—can really make a difference—particularly for bass. I’ve been through several variations of drivers and foam inserts—and have finally found a reasonable solution that works for me yet isn’t a customized mold (KZ ZAR/ Sonic Care). Again, quite happy with where I’m at, though with a few more jobs, I may ultimately go full customized IEM. Something to work towards.
Good luck with your journey!