Ive used both the magic mouse and trackpad for 1-2 years and the advantages they offer (many nice gesture support) are heavily out weighted by the fact that their just terrible products. More so the mouse, it the single worst mouse, in typically Apple fashion its a mouse that looks nice in press shots but its horrible in terms of ergonomics, pretty finicky since most of the surface is touch sensitive and it doesn't add enough gestures to be useful.
Personally my mouse of choice is the MX705, love it, logitech use a small wireless dongle so it takes up 1 port forever, but in exchange my last mouse lasted 4 years before it started acting up and I never once replaced the batteries it came with. It has a few extra buttons, one where your thumb rests that I use for expose, and a back/forward buttons so it covers a decent amount of the gestures I need, everything else I do is done with the keyboard. Honestly love it.
If your willing to spend more the MX Master/Anywhere are great. If I was to go with something Apple it would be the trackpad, its not comfortable too but at least it has all the gestures, the mouse is just a bad mouse with a subset of the usefulness of a trackpad.