This movie is clearly superior over the first one. I was actually impressed by the Animation and Colorization, it looks splendid. The snowy scenery helped to built a good atmosphere and even inside the building they did a very good job imo. Also it was a smart decision to implement 2 main villains (Willow is the main guy sure, but Dr. Kochin served a good part of it too). Willow remained the mystery guy for a long time until he gets revealed, which adds another layer of tension in the movie as you want to see who this person is. Even the secondary cyborg henchmen were allnicely designed and had interesting short fights. The climax fight in the end was also really diverse and entertaining and Goku used all of his famous attacks at this point (around Ep 40 of the DBZ series). I even see some character resemblance between Dr. Willow and the later Dr. Gero of the main series.

Also it felt really fresh to see Muten Roshi fight which happens rarely in the DBZ series.

I would clearly recommend this movie for DBZ Fans who haven't watched it so far.