In terms of Apple mice they are - the Pro Mouse is gorgeous and has a real high-quality look and feel to it, whereas the multi-button Mighty Mouse looks and feels very cheap and dull. In terms of functionality a two-button one with a scroll wheel is of course vastly superior, though I could never bring myself to use a PC mouse with a Mac and wouldn't want to sue a Mighty Mouse, so the Pro it is
Who would want to use one of the old ADB mice when they could use a Pro though? I use a Pro on my Mac just because it looks so awesome and has a really nice feel and action, the ADB mice are pretty nasty in comparison (especially the old square ones, you only have to look at them to know they are not going to be comfortable to hold!).