What is going on with C&C Generals, Black OPS and Duke Nukem in El Capitan? I forget now but I read a disconcerting "if" about one of them getting fixed at all on the support pages, I think it might have been in reference to Black OPS crashing in El Capitan.
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To answer your question: you say that you like simple and quick. Additionally, you already have iTunes credit to spend. For these reasons, I would recommend sticking with the app store so you do not need to be involved with downloading and using the Steam client. It isn't hard and you can set it to run in offline mode once you've run a game one time (this is true in Windows - I don't know if you need to do this on Mac) and then you can play but it will always require loading the client first before your game starts. You may or may not find this an annoyance but you I wanted to make you aware of it in case you would. As you know, buying something on the App store results in it just starting up without needing to start the app store first, etc. So you go directly to your game without delay. Many don't feel this is a big deal and I will not voice any opinion either way. This is just an FYI for you.
I didn't check the game in question but often additional content for a game is purchasable as in-app purchases to get the full version with all DLC, etc. It is true that more often than not Steam is cheaper IF you catch stuff on sale but where you only want a very small number of games and already have store credit I don't know how that should really matter that much. It's up to you of course.
For someone like yourself, I consider the App Store ideal.
