My two cents is that I am not the biggest fan of GURPS. I’m not sure which edition I played, though it looks like it would have been 4th ed.
I’m just not sure what kind of game I would use it for that there isn’t something better.
If i wanted something that let me have like a super hero, a dnd wizard, a ninja turtle, and a cyper punk robot all together I’d use SCRPG. SCRPG actually does this a lot better. You can make both Batman and Superman in GURPS, but they are nowhere near the same point level. One or the other is going to feel out of place
If i wanted something that was more tactics based with a less permissive set of rules that was a lot more strict about what you can and can’t do I would use some form of d20
I think the only thing GURPS offers that other systems don;t do better is when its at its most GURPyest and you are dealing with all the fiddly bits that are there as optional add ons and if that is what a group wants from a game then its what GURPS will give them, but i think it ends up getting in its own way a lot.