Macross: Do You Remember Love?, Mobile Suit Gundam III: Encounters in Space Recommendations
Both movies summarize their respective TV series. They are made around the same period, and have similar art and animation. Both focus on intense battles between mecha, and also have some romantic elements (which are more highlighted in Macross). Both have an overall similar vibe, with the main difference being that Gundam is a bit more mature, while Macross focuses a lot on music.