Tethered devices offer the ability to utilize the full power of a powerful gaming PC, which means better graphics. Untethered devices allow for ultimate portability, which can offer its own, unique type of immersion. The main point of consideration is that you’ll be limited to your headset's proprietary platform for purchasing games if you have an untethered device. This means you’ll be missing out on Steam VR, which offers the largest variety of titles. You do, however, have the option to use the Link Cable if you go for the Quest 2: this will allow you to hook your portable device up to PC and utilize Steam. It won’t offer quite as good picture quality as a fully tethered device due to the compression, but in all honesty, it’s a fairly negligible difference.