I've used both bullets on a range of game, from impala to cape buffalo,, and I agree both are great bullets, and you likely won't be unhappy with either one. But of course, that doesn't answer your question!
If I had to choose one, I'd pick the A-Frame. Not because it's the only one that will work, but it's the one I've had the best performance with. I recovered a TSX (.300 Win Mag) from a waterbuck, and it had only partially set up. Only problem I've ever had, and it could be due to a whole range of things. But I've never had even a single problem with the A-Frame.
I've tried to attach a picture of an A-Frame I recovered from the off shoulder of a wildebeest I shot last year. Perfect mushroom. You couldn't ask for better performance.
So out of lots of shots with each, I've had one issue with the TSX and none with the A-Frame. Split decision to the A-Frame.