The 4J Studios version is much better. The bedrock version plays the exact same as every other bedrock version. I love both 4J Studios version and Java about equally.
It may not be as big and deep as games like Mario Kart Wii, but it definitely will keep me entertained for hours I think. I kinda have nostalgia for it in a way because I remember playing with a toy MKW Car when I was growing up hehe.
Mario Kart Live actually seems really fun to play now that I've taken a closer look at it. When it was first revealed I was kinda meh on the idea, but now that it's shown off more. It seems really fun to play with. Especially with family members.