A:Answer As far as which is better, it depends on what you are willing to trade off. Both headsets are virtually identical as far as sound and function. I believe the Arctis 5 mic. has a higher frequency of 22000Hz vs. the Arctis 7 20000Hz. The higher frequency has a better response to clear and crisp treble. I have the Arctis 7 and I do not find any issues with the treble.
What I mean about trade-off is, if you like the idea of having a headset that changes color around the outer headset then the Arctis 5 is for you. The Arctis 5 is a wired headset meaning you will be attached to your gaming device and can not walk around listening to music.
If you do not need a headset that changes color, which you can not see while wearing them anyway, and would prefer to have the ability to move around wirelessly, then the Arctis 7 would be your best bet.
I personally do not have a need for a color changing headset and also prefer to have wireless. So I chose the Arctis 7. Not disappointed at all.