Should I get the a40's, tritton ax pros, or tritton ax 720?

I was thinking of going with the a40's but I don't know why. Can someone tell me which headset is better and WHY??? I think the a40's are great because of the communication, sound quality, and portability and the mixamp. Please let me know. I will probably go with the a40's but I want to be sure. Price doesn't really matter to me if the astro's will be better than the others. Please help!?!?!?!?!