There's no way you can earn as much credits as running A-Spec Indy in Like the Wind doing B-Spec, remote or not remote. You'd need at least twice as much time earning that much in B-Spec. And you'll probably need at least ten times as much time doing remote racing. But, as has been said, Like the Wind you have to drive yourself, B-Spec you have to keep telling your drivers to start the next race, and remote racing, you can get away with not having to do a thing for extended periods of time.
As for leveling up, remote racing is actually rather good for that. Doesn't do anything for your A-spec rating, but it earns a good deal of B-Spec xp.
Prizes you only get for "offline" A-Spec and B-Spec, nothing to be had in remote racing.