Do you need transformer isolation? If you’re not sure you almost certainly don’t. I’ve been working in studios for 10 years and most of the time you just want a mult.
I am not sure. I want to keep the signal clean for live playing (avoiding interference, ground loop buzz, etc). I don’t need studio level noise reduction but also I want to maintain signal fidelity to a reasonable degree so that there’s no tone bottlenecks in my already expensive rig. Because I am an audiophile I am okay investing within reason to avoid unnecessary harmonic loss.
Part of my motivation for this splitter was that it had direct pass through on one out and a ground lift switch on the other two. I want more control over my output just in case the FOH hardware has something funky happening. I know Y-cables are another option but I got the splitter used for a lower price than Y so it was a no brainier. Getting/modding a second one is the next consideration.