I'm oldschool, it's just Anti Aircraft for me thanks.I won't post the wiki link for you, that's too far. TOO FAR MAN!
Doesn't it depend if you are referring to a specific piece or not? I'm aware that the UK traditionally has just used AA, ack-ack, archie etc... My experience outside is that AAA, or triple-A, is used more commonly. Feel free to correct me!
I don't have strong preferences about the ingame AA though, if it looks better and doesn't kill my framerate then sure, I'll press any of the Shiny buttons, really. If any of the extra visual toys start to bbq my actual gameplay then I don't use them. I really haven't noticed Elite to look too much better with it on myself though. I've used Zacam's trick of the larger res scaled to screen res, and that seemed to give me a lot better look generally than anything ingame has produced.
That's an interesting trick, but assumes your rig can handle the extra res plus downscaling. Might give that a go...