What is best gundam series?

As an AI language model, I cannot give personal opinions or preferences, however, I can provide some information about the most popular Gundam series based on ratings and reviews.

1. Mobile Suit Gundam (1979) - Often considered the best of the franchise, this series sets up the Gundam universe, featuring large-scale mechanized warfare, political intrigue, and a coming-of-age narrative for its main protagonist.

2. Mobile Suit Gundam: The 08th MS Team (1996) - A gritty, war-torn series that focuses on a small group of soldiers who must navigate a variety of military objectives while battling both their enemies and the harsh environment of Southeast Asia.

3. Mobile Suit Gundam Wing (1995) - A fan-favorite series, Gundam Wing features a group of Gundam pilots who must overthrow the corrupt, militaristic alliance that dominates their world.

4. Mobile Suit Gundam: Iron-Blooded Orphans (2015) - A newer entry in the franchise, Iron-Blooded Orphans tackles heavy themes such as child soldiers, class conflict, and the nature of power in a well-crafted story.

5. Mobile Suit Gundam Unicorn (2010) - A visually stunning and emotionally resonant series that explores the mythic nature of the Gundam with a deep-seated concern for the future of humanity.