I don’t know enough to have strong opinions on which is better for Syria. I would guess the new regime because of how horrible Assad was, but that’s little more than a prior. As for the claim about foreign born rebels, it’s difficult to find numbers on this but the best estimates I can find put that number as numbering in the few thousands.
https://observers.france24.com/en/middle-east/20241220-syria-foreign-fighters-jihadism-extremism
All I’m claiming is that wailing about the poor Assad regime being slandered is flat out wrong. There’s mountains of evidence that the Assad regime did in fact commit lots of war crimes.