I finally got around to trying the Scorpion, but even for settlement raids and surface markers, the Scarab seems overall better in most aspects, especially when it comes to long range combat.
Edit: it seems good at killing sentry skimmers, but you gotta get pretty close because turrets are so inaccurate
My preferred playstyle for SRV combat is to pick enemies off at a distance, so I’ll stick with the Scarab. I can see the fun in using it for multi-player stuff though. I have yet to explore guardian sites.
Plus salvaging in the scorpion is tough with only two inventory slots