OS2 is super underrated. It got pooped on at release cause it was "just a SD1 and DS1 with a sweep knob" and that's only half true; on either end of the sweep it doesn't quite nail either of those, though the similarities are there imo. I find it's most happy with the sweep somewhere between 10 and 3 o'clock with the tone control to taste (usually at around noon, tho)
I have almost every od and distortion Boss ever made so I might be biased lmao