Should I watch FMA before Brotherhood?

When It Makes Sense

• Good fit: You enjoy a more character‑focused narrative with original plot twists and don’t mind occasional filler episodes; the 2003 series offers a unique story that some fans find more emotionally resonant.
• Good fit: You have ample viewing time and want to experience the evolution of the franchise, appreciating how the early adaptation diverges from the manga and influences later storytelling.

When You Should Avoid It

• Warning sign: You prefer a strict adaptation of the manga and want the most faithful, streamlined plot; Brotherhood follows the source material closely, making the 2003 series less essential.
• Warning sign: Your schedule is limited and you wish to finish the main storyline quickly; starting with Brotherhood avoids the extra 51 episodes of the earlier version.

Pros and Cons

Pros

• Provides a different thematic tone and original story arcs not present in Brotherhood, enriching overall understanding of the franchise.
• Allows you to appreciate the development of characters and animation techniques across the two series.

Cons

• Contains filler and plot deviations that can feel slower compared to the tighter pacing of Brotherhood.
• Watching both series requires a significant time commitment—approximately 100 episodes total.

Decision Checklist

• Do I prefer narrative faithfulness to the manga or am I open to alternative storytelling?
• Do I have the time to invest in an additional 51‑episode series?
• Am I comfortable revisiting characters and plot points that will be retold in a later series?

Alternatives to Consider

If you are unsure about committing to the full 2003 series, consider watching a curated set of its most acclaimed episodes (e.g., the early arcs and the final season) or reading the manga chapters that the original series diverged from. Another option is to start with Brotherhood and, after finishing, decide whether you want to explore the earlier adaptation for a fresh perspective.

Final Recommendation

For viewers who enjoy exploring multiple creative interpretations and have the time, watching the 2003 Fullmetal Alchemist before Brotherhood can add depth and appreciation. If you prioritize a concise, manga‑faithful experience or have limited viewing time, starting directly with Brotherhood is a sensible choice. In either case, assess your preferences and schedule before committing.