TBH would do both of them (even separately). Have seen Jamie R around Auckland and she def looks nice in person. Hotter than your average etc. Rosanna looks classic 'Aussie' hot, which I like. Bit of a beak on her, but still bangin bod and nice eyes.
From what I gather on Mai fm interviews - Jamie took this thing seriously by training with Monty betham and stuff. Rosanna joked that she would do it for the post fight KFC, and then modelled bikinis for people to decide which one to wear. I was kinda Team Rosie :p