User Recommendations for Fullmetal Alchemist: Brotherhood

Both are mature action series that have a great set of characters, a good plot, and amazing art. Definitely recommended for action lovers who find Bleach/Naruto/One Piece too childish.

Ok, this is going to be hard to explain, but first, I will and never compare brotherhood to a crap series. this series is good. Magic (Alchemy), well developed characters, world domination and survive of the fittest. Fate zero put in challenge the skills of their characters, fighting each other to achieve one goal. Same with brotherhood, where the alchemist, using their skill at their full, must uncover all the mysteries behind the ongoing events. Filled with mystery, thriller and action, these both anime wouldn't disappoint you.

Both series use a non-medieval and interesting take with magic. Although, while FMA is in the 20s/30s, Zero is set in the 90s. The Battle for the Holy Grail is much like the search for the philosopher stone except that it's more of a no holds barred tournament with very few rules. Fate Zero's main difference is that it expands on the idea of kingship brought up in FMA Brotherhood and the cynical contrast to FMA's optimism.