PICU or NICU

Hi all!!
I am a general peds nurse and I am going on three years now - hard to believe goes by so fast. I enjoy what I do, especially the kids. We have newborns to age 19 for our pediatric population and then we also take care of Women after gyne surgeries as well as postpartum.

I want to be more marketable and advance in my career though and I am thinking of moving from my area (smallish town) in about two years. In your opinion is a position in the PICU or NICU more suitable to my experience? Which one would be a good transition for me and make me a little more marketable? We have a NICU at our hospital and I float there occasionally.. it does interest me but it is like a cave in there and I think that might get old fast!! Are all NICU's in a small room ?? My only experience is the hospital I am currently at and we don't have a PICU. I would really appreciate any replies... I realize PICU's and NICU's are quite different - I guess I just want to see what other experienced RN's might think..Thank you!!