I can't much disagree, after all, as I said above, I do feel in a lot of ways FMA:B is objectively better- well, about as objective you can get about something like this (since at the end of the day it's really all subjective).
But I really feel that I like KlK's one of my favorites because it doesn't have the indomitably varied appeal of FMA:B. Don't get me wrong, I think Brotherhood's fantastic, but you really are a lot more likely to find something that's made just for you when something is...niche, I'll say for the sake of this. For me, KlK strikes a lot good chords for me: themes of family and familial relationships are present throughout and at the forefront (and I hope you guys know how much I love that in an anime), it's OST is fun, it does pretty much whatever it wants in terms of animation, a host of female characters that are strong (physically and/or personality-wise) on their own merits and it isn't constantly spotlighted, and when it's over-the-top, it hits me (something a lot of Shounen try to do but is only a varied some actually do effectively). Plus it has a song by Garnidelia. Ambiguous, I mean c'mon. C'MON.
I'll say Brotherhood has the better characters, story, openings and endings (though, as I said, to me Ambiguous is God-tier, but Sirius and its endings I usually skipped so I couldn't really justify that), and the better overall quality. That has never been nor ever will be in question. But I also think that, and this might sound a bit off, but if KlK had a better story and characters, and better consistent quality, it wouldn't be Kill la Kill. I really do think Pokestick hit the nail on the head with his assessment about how prior experiences affect these specific anime, and its really in knowing Trigger-as-Gainax that this deal about Kill la Kill having those better assets is supported.
Because Kill la Kill was never intended to be a deep show with deep characters- it was meant to be a fight manga, and in a lot of was its framework is very classic and campy shounen- it knows this. This isn't to say that its story's bad- far from it. It would be a lot harder for me to name characters I didn't like in KlK than those that I did, and the story certainly had its twists and hard-hitting moments. But this really all brings it all full circle.
Essentially what I'm trying to say here is that all things considered, Brotherhood and Kill la Kill are both exactly what they want to be. Brotherhood's a fantastic show, and I really think Kill la Kill is, too- but for vastly different reasons, and if you're going to say which is better as an anime, I'd definitely go with Brotherhood. It's a good watch for even non-anime fans, has a great focus on story and character, and it's just all-around quality. That said, Kill la Kill knows what it wants to be and it will really resonate with those that it's for; it's definitely the type of show that should be taken for what it is rather than held up to a general standard.