I have Steelseries Siberia V2, and tbh, I didn't expect much from a 'gaming' headset, but their pretty ****ing good, I use them with an Astro Mixamp on Xbox and they're sick.
I have Sennheiser HD25-1 ii and Beyerdynamic DT 770 Pro.
And I prefer the steelseries for gaming. However, the 360's are open back headphones and so in theory should offer a better soundstage, which is what you want for positional sound. So if you can afford it get the 360s if not, debate between the Steelseries and the PC350s.