I voted for Stars and Motor Cars as I liked it MUCH, MUCH, more!
I like how Stars and Motor Cars used a LOT more characters than just from 3 Pixar films so there was a LOT more variety. You had the Star Wars characters representing Star Tours (it was always a highlight when R2-D2 would roll over to me and beep!) the Muppets representing Muppet Vision, plus a LOT of Disney characters representing both new and old animated classics from Snow White all the way to Mulan. And also, Mickey, Minnie, Donald, Goofy, and Pluto were in it!
Even with all those characters, Pixar still got representation with Toy Story and Monsters Inc.
I also liked the motorcars themselves which were charming in their design and also fit the park's theme of "Old Hollywood" perfectly. I just feel that this parade was much wider in scope and really captured the spirit, theme, and scope of the park much more than the current one. In that sense it reminded me of Jammin' Jungle Parade at AK, because both of those parades really ARE their parks, IMO, and fit their parks perfectly like a glove.
Also, music is a big part of the park experience for me and the parades are no exception. I absolutely LOVED the catchy musical theme of Stars and Motor Cars, which was written just for the parade. BPB uses regular pop music from outside the parks, which is "less magical" for me. And even if you are trying to enjoy the music of BPB, it is unfortunately constantly being interupted by the Green Army Men in full "cliched obnoxious DJ mode" with inane chatter like "C'mon" and "Let me hear you scream". How about you shut up and let us hear the music?
If you just close your eyes and LISTEN to BPB it sometimes feels more like a nightclub to me than a Disney parade... a bad nightclub!