If you loved Dragon Ball: Episode of Bardock, try Dragon Ball Z: The History of Trunks
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Dragon Ball: Episode of Bardock
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Dragon Ball Z: The History of Trunks
What they share
Both films are directed by Yoshihiro Ueda, and they sit in Action / Animation / Science Fiction territory. If that's the register that drew you to Dragon Ball: Episode of Bardock, the second film will land in a comparable space — through a different lens.
What Dragon Ball Z: The History of Trunks is
You fight for survival in a post-apocalyptic world, but a young warrior's fate may change everything. The director's vision leaves you with a haunting possible future.