Dushmany, on 17 December 2012 - 04:06, said:
I'd recommend the Logitech, purely because I have the Z3 - 2.1 speaker system, and had an arguement with a guy in My nearest Apple Store, who kept tyring to sell me the Bose Companion 2.1, My Z3 blew them out of the water in bass, tho the sound clarity wasn't as good, but then again, with how much the Bose were going to cost, I could have bought 4 sets of Z3's (at that time).
But Bose is regularly bashed by "so called" audiophiles. Some say BOSE is an acronym of "buy other sound equipment".
Bose is all about marketing, they repeat everywhere they are the best, and some believe it.
You might find more info at head-fi, here's a thread discussing about the Logitech z623.
Personally I'd buy neither of these speakers. If you have space on your desktop, just could buy for instance harmann soundsticks 2.1.
Logitech is just a mass market brand not very specialized for audio.