I'm not the expert on Aniplex that other people are on this forum, as I don't buy Aniplex. I can only speak generally, and tell you what I guess you already know, given that you're asking the question. Generally, Aniplex authoring will be the best when it comes to video quality. But you will pay through the nose for it. And apparently when it comes to dub audio, Aniplex discs tend to be lossy, not lossless, although you'll have to check on that on a by title basis. If you want something just to watch, then if you're like me, the localised versions of the shows you mentioned might suffice, as I find that issues like incorrect gamma, increased banding, added compression all tend to be forgotten once I'm really into a show.
But if you're enough of a fan that owning the best possible presentation of a show really means that much to you, and you have the money to spare, then by all means, that's what fandom is about.
Personally I don't have the money burning a hole in my bank balance to justify it, but if I did, I'd be Aniplexing over Full Metal Alchemist Brotherhood, Fate/Zero and Anohana.