Flurry was one of my starters, so I'm surely biased towards her. But she's so cute and white and chubby <3
Fauna is really pretty as well. As for Marina... her color is beautiful, but that octopus mouth is a bit... (sorry octopus fans)
Fauna! If I had a little extra room in my town, I'd gladly have her too. X)
I've had her before though, and she's really sweet. ;o;
I've had Marina before too, and while she is lovely, she didn't really grow on me.. Maybe you could try to find them in dream towns to see what they're like in person to make sure?
I've had all of them at some point and I personally got kinda bored of Marina! I have Fauna and Flurry in my second town and I love them both, but I voted for Flurry because she's tiny and adorable and I just love the hamsters