vahju98 Budgie. I recently installed Solus Mate on a similarly-aged computer thinking it'd be a better choice than Budgie on older hardware, but then I switched it to Budgie and didn't see any noticeable performance difference, plus Budgie has a nicer interface. That computer only has integrated graphics as well, so you should be doing even better with a proper video card 😀
I'm gonna install Solus Budgie (or Plasma) on my (9-year old) desktop tonight, so wish me luck 😁 it worked well testing on USB anyway...
also, if you install Solus with one desktop environment, you can always change your mind and install a different one from the software centre. I know it's not fully recommended, but I've had no issues switching this way (with Budgie, Mate, i3)