My first advice would be: Please try them both in your room!
But purely based on my personal opinion, If I had to chose without testing, I would put my money on the A7X. In the room where I tested both monitors (and others), I found the A7X to have a little less boomy low, and to me, this sounded more controlled. I also had the feeling that vocals had some more detail. But.. keep in mind, this whas a test in a shop, and results in your own studio can be very different!
Have you done acoustic treatment in your room? This is extremely important!
Check out Ricardo Munoz his first official release on Youtube!