This is a manga adaptation of the semi-canon Toei special of the same name. Toriyama claimed he preferred this version slightly (in his classic non-commital fashion) so I was curious to see what the difference was. It's really very minor. As a story the manga is very faithful to the original short, down to the same jokes and situations. On the changes, most of them are what the manga chooses to cut, stuff like Goku and Vegeta being competative when they first meet up, extra scenes of the old characters, stuff like that. Some of the fight is changed for the better, but for themost part the weaknesses that I had with the original special remain present here. Stuff like Vegeta feeling a bit off, the premise being inconsequential by nature, etc.

As an artist, Ooishi is servicable for the material, her art is consistent and I never felt like she drug the adaptation down, but she isn't as good as Toriyama. Her backgrounds felt a bit lifeless and her panneling is nowhere near as good as the master. Still it was interesting to see a take on these characters where they're drawn a bit cuter (especially the guys).

Ultimately i'd have to err on the side of the Toei version, I thought the material was covered slightly better there (funnier jokes, better use of old characters) but it's really a wash. I suspect Toriyama's statement might have been for marketing reasons or to be polite to Ooishi, but if i'm to take his word as the truth, i'd say perhaps cutting some material made the characters feel a bit more consistent with the manga and the pacing was a bit more his style. My recommendation to others would be to choose the medium they prefer, and you're gonna get about the same experience either way.