Given that both have been out of production for half a century, difficult to say. Unless you had a box fresh example of each.
I've 2 of each, circa early '60's & '70's. So they've had many previous owners & scope for neglect.
Both the Mk 3's are in good condition - the later (button rifled(?)) one is more accurate.
The Mk 2 Airsporter has suffered - never mind car boot condition, more like skip find. Not fair to comment on it. But the BSA A/S Mk 4 (1969, I think), is damn good with a decent 'scope.