I found some information about their careers and it seems that
Isabel Gemio has just been a presenter for all her professional life whereas
Jesús Hermida has been working in some posts of responsability currently being the "director adjunto" (co-director) of Antena 3 TV.
As Pim said, you can only see him sometimes in TV shows, but he is regarded as a great jourlanist and professional.
Obviously, I agree with Calibasco. Isabel Gemio is better looking and younger.
As for the comedians "Martes y Trece", they decided to end up their career and started their own projects several years ago.