[supertv247]

I really can't pick because 13 & 14 were good but 17 & 18 have been good...
I think I'd say BB15 & 16 are not the same era as BB17 & BB18 though. Plus BB14 is in the Emma era unlike 12 & 13 so I'd say that's different

I'd say it's the Brian era of BB12,13 then the themed era of BB14,15,16 then 'changing' era (new game BB17, back to basics BB18) although I'd say 14 stands out itself in that middle era