Brotherhood did well on its own in continuing mystery of their origin by mixing them up throughout several episodes,
but I think I prefer the full continuity of the manga.
Not only that, moreso, the fact that they've trained for 6 months being mentioned, and later seeing how Izumi warns them of human transmutation, along with the laws of life, and how Winry worries about them and how they help their neighbors, all before they try to bring their mom back.
Disappointing that Brotherhood excluded all of that.