I know the longer-lived Cullen run is beloved by many, and the UK edition went on for eons, but I've always had a massive soft spot for Bill Rafferty's version of Blockbusters. Rafferty was fantastic on both series he hosted around that time (along with Card Sharks), and although this is controversial, I actually liked both the switch to the 1v1 quiz and the way they solved the problem of the "advantage" (flip sides in round 2, 4x4 tiebreaker). It's a fundamentally different show than both Bill's run and the UK iteration, but I have the entire thing now and have had so much fun revisiting it.
Switching to the player-linked progressive jackpot mid-run was a fundamentally solid idea as well (if you haven't seen: A player's first trip to the bonus was worth $5K. If they lost, it was worth $10K next time, then $15K, etc...BUT unlike Super Password, etc. if that player lost, the jackpot automatically reset. (IE no profiting off past players failures).