The vertical detail is also slightly more intact on the NTSC and is clearly the best (less bad) choice if you want to resize to fake anamorphic as the "PAL" already been blurred and resized once. But for direct view without using a fancy scaler the "PAL" version might actually be the better (less awful) choice for PAL viewers.
I guess LFL used a rather primitive adaptive blur filter that mistook some (much) of the vertical detail for jaggies, but as LFL decided to use an 13 year old transfer to begin with why not also use a primitive blur filter on it, it seems to fit.