Diamante or Nauyaca falls?

This will be our fifth trip to Costa Rica, and the first time we will heading to the Osa Peninsula.  On our way there, we will be spending a few days in Uvita.  While we are there we were hoping to hike either to the Nauyaca waterfalls or the Diamante falls.  

Give your experience with both, if we only had time to see one of those two waterfalls, which would you suggest and why?

Thanks so much for your help with this.