Why? For the 90s and 2000s kids, this dub represents a time when localizing media wasn't an afterthought. The voice directors understood that a hero sounds best when he speaks your mother tongue.
Fans of the series (across languages) consistently rate these episodes as the best for their plot and visual impact: The Ultimate Sacrifice
The Malay dub of Ben 10: Ultimate Alien is a nostalgic favorite for many Southeast Asian fans, known for its consistent voice acting that often matches the high quality of the original series.