Baby Blooper's also got surprising high acceleration/mini turbo and handling for being such a high speed vehicle which gives it an edge over Mach Rocket which shares similar speed stats for terrains. www.mkworldbuilder.com This website shows you the stats clearly, so you can compare what you like.

Not really, the current optimal vehicle is the the Baby Blooper due to its high road speed stat,as road is the most common terrain that's driven on compared to water and coarse terrain like dirt and sand. For character, I'm not 100% sure but I've commonly heard Wario and Daisy's stat groups are good