[Jason.]

They all have their flaws tbh as they all having boring parts. BB7 and BB8 have a reputation for getting dull post-Week 8 (when Nikki and Charley are evicted).

I don't remember much about BB9/10 and need a re-watch. But I think BB7 is the one that sustains itself the best imo - but that's probably because I didn't really find the post-Nikki weeks that dull and there were good tasks and Aisleyne to keep it going. And the peak weeks of BB7 are better than the peak weeks of BB8-10.