I recently booked our early Dec trip with teenagers so I will offer my thoughts on that. Our trip is a 16th birthday present for my daughter. She is bringing her two best friends. Although we have been to Universal many times, this is a big deal because she has never had a friend come with her. Also at this age we plan to give them a little more independence and will allow the three of them to tour the parks separately from us. Neither of her friends have been before, and none of us have been since WWOHP opened. Because this is a special trip and one that she will likely always remember, I really want to make it the best it can be.
We have stayed at both hotels before. The RP is beautiful; the HR is "cool". You really can't go wrong with either one. She has even told me it doesn't matter to her where we stay. So, if the trip were just my family (me, hubby, 2 teenage daughters), I would probably save the money and stay at RPR. But to me, the hotel that screams out the celebration of the teenage and young adult years is Hard Rock. And for this particular trip, I wouldn't choose any other hotel.