Agree with both. Kinda an interesting dilemma for the 2013 Cain. If she went the NCAA route, she would've had all the great social and team-bonding experiences but her times would've stagnated anyway, as she would've been training and racing with runners far below her level. She would've been placing high in the fast heats of collegiate meets like Payton Jordan, but running in the 4:09-4:13 range for most of it. Having come off running 4:04 and making WCs, that would probably be torture for her having to step back for a few years from what she knows she's capable of.
On the other hand, she goes the pro route, lives alone, is a Nike lab rat, spends all her time with pro athletes married and way out of college, flying by herself to meets across the country while trying to fit in her schoolwork, with none of the team bonding aspects and twice the pressure to perform, still runs way off her PRs anyway.
Almost seems like you're cursed either way as a teenage star. The athletes who were able to succeed as pros were ones like Simpson and Coburn that rose steadily through the collegiate ranks until they were on top by their junior or senior year. Got all the good team experiences during their tenure while still being challenged to improve. Sets up well for a good pro career.