Should I watch FMA or FMAB?

When It Makes Sense

• Good fit: If you have limited time and want a faithful, concise adaptation of the manga, Fullmetal Alchemist: Brotherhood (FMAB) is the logical choice because it follows the original storyline closely and finishes in 64 episodes.
• Good fit: If you enjoy exploring alternate narratives, character back‑stories that diverge from the manga, or a more experimental tone, the 2003 Fullmetal Alchemist (FMA) offers a unique story arc that many fans find emotionally resonant.

When You Should Avoid It

• Warning sign: If you are sensitive to abrupt pacing shifts or filler arcs, the original FMA’s later seasons incorporate original content that can feel uneven compared to the manga.
• Warning sign: If you are watching with very young viewers, both series contain violence and mature themes; you may want to review content warnings before starting.

Pros and Cons

Pros

• FMAB delivers a complete, manga‑faithful plot, giving closure to major storylines in a predictable timeframe.
• FMA provides creative freedom, original plot twists, and a distinct emotional climax that some viewers find more surprising.

Cons

• FMA’s divergence can lead to inconsistencies if you later watch FMAB, requiring re‑adjustment to differing character motivations.
• FMAB’s longer episode count may feel excessive for viewers who prefer a shorter, more compact series.

Decision Checklist

• Do you prioritize strict adherence to the manga’s storyline?
• Are you comfortable with original content that diverges from the source material?
• How much time can you realistically allocate to a 64‑episode series?

Alternatives to Consider

If you want a single‑season experience, consider watching “Fullmetal Alchemist: The Sacred Star of Milos” (a feature film) or reading the manga directly for the most concise version of the story. Another option is to start with FMAB and, if you remain curious, later explore the original series for a comparative perspective.

Final Recommendation

For most first‑time viewers seeking a clear, complete narrative, Fullmetal Alchemist: Brotherhood is the recommended starting point. Those who value narrative experimentation or have already watched FMAB may enjoy the original 2003 series as a complementary experience. As always, assess your schedule, content comfort level, and preference for fidelity to the source before committing.