Mandy is a professional woman and legitimate superheroine who knows what she wants. Sure she's a little bit "boring" but ultimately she's a loyal and romantic person who just wants to be treated like a woman (fucked mercilessly and cuddled). She is the default, vanilla option.

Visi is a voyeur and a straight up slutty stalker BPD nymphomaniac freak who still doesn't even have the courage to ask Robert out to the movies, despite spying on him in the bathroom and violating all kinds of policies while she does it the very same day.....She's the alternative. She also PUNCHES ROBERT IN THE FACE and never apologizes!

If you're interested in a story that really goes somewhere with some twists and turns, then you would go for Visi. If you're interested in the super hero pure romance, you go for Mandy.