What mouse is better: serial ou bus?

[bhutch at shine17.waterloo.edu]

What mouse is better for Xwindows on Interactive Unix 2.0.2,
serial or bus? Two or three buttons? Microsoft or Logitech?
What about Logitech's Trackball?

Post or e-mail your experience, I'll summarize it for the 
frequently asked questions.

Thanks in advance,

JR Setti
U of Waterloo - Dept. of Civil Engineering