> windows 98 / windows 2000 / snow leopard

I don't know if I would group those together. Windows 98/2k were visually similar, but OSX by that point was looking quite refined.

It had toned down the blue, but still had some visual flare.

95/98/2k had a very utility appearance. Just compare the recycle bins between each to see how much more effort went into OSX look and feel.

My favourite OSX in terms of visual design was the Panther/Tiger era personally. Leopard looked good, but there was something really cheerful and friendly about Tiger. The iPods of those days were also really well thought-out in my opinion.

Definitely a world apart from the utilitarian Windows 98 UI.