[WOW] MUltibox on low pop or high pop server?

What do you guys think is the best type of server to Multibox on.

*edit* spelling

depends, low pop is less attention if you want discretion...

PvP I'd say low would mean less ganking, but also less targets to kill, high population would mean the opposite
PvE higher pop would mean a better economy imo, as these servers tend to also be older..

Guess it depends what you're after :)