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Wireless because I cannot stand the cord getting in the way. Yes, it requires batteries, but if you use lithium batteries, they last forever.
Eh, long forever as far as mouse batteries go :P
So, a few months. lol
If it doesn't have a cord (tail) would it not more correctly be called a hamster?
Anyhow, prefer a touchpad. Requires less desk space. Wired or wireless, makes no difference as the device doesn't actually move.
Corded - it's easier to retrieve when I drop it.
For me, wired. Always. I dont like changing batteries.
I only had one wireless mouse and it conked out, so now I am back on the wired ones.
Wireless
The less wires the better. I hate wires . Of course they have to make wireless objects even more annoying than ones with wires, but that is another story. I have a wireless mouse. That was a no brainer.