I like his 2000 Mr O + post Olympia GP shows physique the best - he was bigger, denser, thicker and freakier in 2000 than he was in 99, where he was a bit more conditioned, but a little smaller.
01 AC classic was good and his 2003 / 2004 shape had lots of muscle, but it was just lumped together and he looked awkward hitting a lot of poses like the front lat spread. And Ronnie was never good at posing anyway.