Well, I think Rocco is more recognised because he stayed longer in front of the camera while Pierre always put in center of its shootings ladies... then only porn fans recognise him.
Of course, things change: Pierre is now a celebrity well recognised during Cannes Film Festival (and not just in Cannes Hot d'OR); Rocco did also some mainstream movies and TV adv (in Italy).
On the other hand they have been until now so wise to not expose their families to cameras...so they can "even" enjoy a normal family life