While I really have used either too much, I have tried out my friend's Kraken and enjoyed it...
Razer Kraken USB (approximately. 47.28 euro)
Usb plug, headphones light up (I think), Built in mic, virtual surround sound, 32mm drivers.
http/www.razerzone.com/gaming-audio/razer-kraken-usb
Razer Carcharias (Approximately 55.46 euro)
Usb, HDMI, and pretty much every other plug and adaptor in existence, XBOX compatible, inline remote (remote in the cord), 40mm drivers.
http
/www.razerzone.com/gaming-audio/razer-carcharias-...
*Approximately means I used Google to convert from US dollar to euro
PS. You double posted, you may want to remove one!