ive got the Xvives and Boss WL-20
The Boss sound a bit better, less artefacts when the notes are dying off. I've only head this at home in a quite room when sitting in front of a rig. Never been a problem with the band though.
I did tend to favour the Boss for rehearsals and live use, as its a bit more robust as far as connection goes. My guitarist uses Xvives and he has had interference with his, while my Boss ones were fine. not a lot in in, but IME the Boss work a bit better.
Where the Xvives really win, especially (IMO) in the OP's case, is they have a proper on/off switch. As long as you aren't using an active bass and a pedal running on batteries you can leave them plugged in. The Boss ones have to be removed or else the battery drains more. I used to leave my Xvive plugged in to my Bass, even when its not being used and in its case, and the other end in my Stomp. I loved that i didnt need to plug anything in when i wanted to play bass, just switch on at each end.
I used to play sitting on the bed, which is against the other side of the wall that has our router on it. Never really had big issues with either system, although again, the Boss less so.