Benji has repeatedly told me he prefers riding in the car to riding on the bike. When asked why, he usually tells me that (a) he can see more in the car (probably not true when we use the Xtracycle); (b) I tell more stories in the car (definitely true, since I spend more time breathing hard on the bike); (c) he didn’t have to wear a helmet in the car (true).
But another reason may be that he can do more things without worrying about dropping and losing them. For example, I don’t give him books on the bike because if he drops them, they’re gone forever. In the car, not such a problem.