Very cool, hope you get some good trigger time with your new acquisitions soon.
I’ve looked at the AO-1 and while I like the idea of the bull barrel I’m not sure I’m ready to move away from the Shadow 2 platform since I have so much invested in those. What I have considered is the Bull Shadow upper for my S2’s if I ever need a new top end. Just time and money, right?
What kind of competition shooting? If USPSA or 3-gun, any of those ought to do you. AO-1 or Shadow 2 for USPSA’s Production Division. You didn't mention which caliber your TSO is, but it’s a good fit for USPSA’s Limited division. Or any of the 3 will fit into a couple divisions in 3-gun. Not sure about IDPA but don’t think any of the three meet their division requirements due to weight or size of the TSO.
I shoot my Shadow 2 in USPSA Carry Optics division, having had them milled to accept the Trijicon SRO red dot. Also shoot them in 3-gun’s Open or 2x4 Division.