I also have an atlas 12x36, and purchased an AXA holder. I did a ton of research into if I should get the BXA, I liked the idea of more capacity, but really, the 1/2" capacity has been more than enough. And getting in tight areas has still been difficult compared to using my rocker post, I can only see a BXA being even worse, the AXA is also right about in the center of its adjustment with a 1/2" tool on this lathe. I don't have any regrets going AXA. Nor do I have any 3/4" tooling to put in a BXA. 1/2"HSS bits work great, as does my 7/pc indexable 1/2" tooling I picked up from grizzly. Hope this helps, just a little advice from someone that was in your same position.