Thanks for the response guys.
The reason i asked for the comparison with Adventure time, because of the fan made Adventure time animation marrying up with FMA B ending 1.
Since they are not related, perhaps a meta the fan was just being meta?
I was very familiar with FMA both oritinal show and Brotherhood, and own both of the box sets. I love them both, with FMA being a product of it's time and from what a remember, a falling out with the original author
Hiromu Arakawa who wanted to finish the manga before the show, but as usually the case, the show runners did not want that, and as a result came up with their own ending. Which in my opinion still made sense, had thoguht put in to it, and was consistent with what the story they where telling at the time.
100% FMAB is the superior show, for the simple fact that it follows the authors original vision, and story and message she wanted to tell. For me the adventure was much more fulfilling in FMAB.
Thanks for the information guys, this has convinced me to check out adventure time.
Hard to believe this cow person made such an amazing Manga and Anime! We in the animal kingdom are truly powerful!