The AO sits ~1” lower than an AT or AX, which makes a huge difference in stability and recoil management.AO sits lower than the standard AT though I assume?
I don’t have an ATX to measure, but my rough math is it sits 0.2-0.25” lower than the AO. So it is better in that regard, but like others have said in actual use it likely doesn’t matter that much when comparing it directly to an AO.
The reason the ATX sits a little lower is because they’re able to relocate the rifle serial number to the 45deg angled face of the action. When I was designing the AO back in 2019 I realized I couldn’t have a bonded chassis where the side walls blocked the s/n so I had to make that concession and eat that 0.25” deeper I could have made it. I’d still rather have the bonded action but that’s just me.