The Axe has a volumized bolt system. It is also easier to control the recpil due to the larger size. I wouldnt say it shoots "way better". A tad better but the size of the Axe is far preferable IMO.
The Vanquish is a turd, for $1500 youd think it would be orgasmic compared to a gun thats ~$350.
Ego 11s are pretty damn loud unless they have a DART kit and are well tuned. (which could be the case with the one you shot) Compared to something like an LV1 or Clone the dhot quality is noticeably rougher but IDGAF TBH and most people probably shouldnt if they like everything else about the gun.