Oh good, we are doing the AA vs current FO thing again!
My quick breakdown is this:
AA had some incredible strengths (persistence, keeping things quiet, contract extensions, media savvy). Through no fault of his own, his only front office experience being in Toronto hindered his ability to grow and come to appreciate some of the critical things more well rounded front offices value (analytics, r&d, resources for minor leaguers, etc). This left AA as a guy who seemed to perform well at the surface level (what most fans see), while falling behind in areas that would seemingly show themselves over the coming decade. So Shapiro disagreement aside, AA made a really smart career move to go work for and learn from the Dodgers. This put him in position to be a high performing executive moving forward, and I'd be quite fine with him being in charge of my team.
However, I also fully believe in what Shapiro has built and cultivated in Toronto, and I wouldn't want it any other way (unless the alternative options were TB/LAD front offices).
In summary, both execs are fine in their own way, but I don't think we'd be in great shape if AA had never left and was given the keys by Shapiro.