I own a 903SH, and personally, the little vodaphone logo on the front really doesnt matter, and since you could just flash the firmware or unlock if locked, its really all up to the hardware, which the 903SH would definetly excel over D600 at in terms of camera and video quality.
Besides, the 903sh plays mp3s really well, so well in fact, that I've given my ipod to my family. (I have the TW firmware, and the bad thing about the battery life is that its sucked dry by playing music, so the phone lasts about 5-7 hours playing mp3's, then automatically shuts off the mp3 player for another hour or so of standby, but an extra battery and a desktop charger makes it no problem at all.)
But that's not all.. If you'd like to go deeper visit the Sharp forums.. Its the hottest phone there atm