[Barbie]

For me its BB6, simply because it was the first one i watched fully, i'd watched BB4 and 5 but not properly, from what i saw of 5 it was good
BB7 was good,
BB8 was ok, not the best.
BB9 i never got into, i went on holiday for 2 weeks about halfway through and then never got back into it. Then it had the awful ending with the blandest housemate winning.
BB10 slowed down, lacking house, housemates weren't the best
BB11 such potential, brilliant housemates but it didn't reach what it could have been