So I had been playing the '19 1x and it was a great ball. Spin, flight, feel was excellent. It was definitely longer than the '19 Pro V for me.
Naturally, I grabbed some '21 Pro V1X and I hated them! Way to much spin in my opinion. Shorter on every club.. So I went to the '21 Pro V and I got that feel and launch I remembered. On whim I tried the AVX and I love everything about it.
The one thing for me is it does offer low launch off the driver. For comparison, I'm normally an 8-9* driver and now I'm 10.5-11*. But the launch angle is exactly what I want to see.
Normally I don't see enough differences between premium balls to say that this or that one is the best. I think they all bring something to the table and it really comes down to personal preference and confidence. After trying almost all the premium balls I settled in Titleist only because they seem to offer the "best" all around performance for ME! But I can say without hesitation, for me, that the AVX is consistently longer off the tee than the Pro V/1X.
One more thing I will add to this already long post. I'm not a simulator/numbers guy. I do all my club/ball testing outdoors on the course or range. So my experiences are from what I'm seeing during play and practice. On paper or in the simulator everything might point to the ProV/1x as the superior ball to the AVX, but not for me!!