Innie or Outie
Not having any experience with an "outie " but I would have thought that having more area to work with would be nice !
Mr Usnow .
Outie or inine.
I love outie but both are all good like hair on it to.
Innie
I reckon its more about the total 'package' - ranging from what's in her head, the connection between us etc. In saying that I would say an innie is my preference and if it is naturally puffy and is matched up with puffy nipples well what can I say....that's how I imagine all the angels in heaven would be 
I do have to say that I did have many mind blowing encounters with a wonderful woman I met through RHP about 11 years ago and she was a massive outie....she called them her saddle flaps !!!