Which Do You Consider More Successful: PS1 or PS2?

[NyanNyanNekoChan]

It's a bit of an odd one. When you look at the sales figures one might easily come to the conclusion that the PS2 is more successful. However, would the PS2 have done as well as it did without the PS1? I doubt it. The fact that the PS1 come from nowhere, and still ended up dominating with something like 70% of market share was pretty remarkable.