For what it's worth, I don't really see FA engines leak oil- it's only the FB engines that seem to leak. The FA20 has been in service since the 2014 XT Forester, and I don't remember seeing any that leaked oil. I've seen FB20's and FB25's leak as late as MY2018. The FA24 (in the Ascent) has been overwhelmingly problem-free for us so far.
To sum up, from my experience, the turbo engines seem far better as far as oil leaks are concerned. Even the turbo EJ has vastly fewer externally leaking head gaskets from what I've seen.