I will love FMA forever and never understand FMA:B. I've read the manga, I like the manga. I do not at all like Brotherhood. The beginning is extremely rushed, the jokes are pretty dry for their frequency, and they cut out a lot of the emotion that made the first FMA great.
What I've seen is that people who like darker anime prefer the original, people who like constant comic relief lean towards Brotherhood. To each their own. *shrug*