Which is the best cruise ship?

Question

I am trying to decide on a cruise this summer to the Caribbean and i've narrowed it down to two ships- Carnival Valor or Carnival Glory- each is going to the same ports of call. I am 25 yrs old and will be travelling with my boyfriend and friends, so I'd like a ship that is hip, vibrant and fun.

We sailed on the Norweigen Dawn two years ago and loved it.