As far as just flying hulls and having fun? I've got three sons just a few years older than you (20, 21 & 23). Get a 1980 or later H16. Trust me, the girls will think it's "cool".
is it easier to fly a hull on a H16? Isn't the 5.0 lighter than the 16?
as for the "girls will think it's 'cool'" aspect, i agree the hobie is more aesthetically pleasing. especially those banana-shaped hulls. what makes the H16 more fun?
speaking of hulls, what is the composition of the hulls in a 5.0? fiberglass-foam sandwich?