2012 Four solar roof or 2012 v5 ATP?

Depends on what you want... Note the following thought:

Prius with the Solar Roof will have solar venting for hot days if that is an issue and you are parking mostly in the sun versus in shaded areas.

The Prius v Five with ATP will have a larger cargo area, the passenger area is a bit bigger and higher, but you will suffer a 10 mpg ding in comparison to the standard Prius.

The ATP package includes a bigger Nav Display (7.1), Advance Parking Guidance System, Dynamic Radar Cruise Control and Harmon/JBL Greenedge Speakers.

Without knowing what you really want or looking for, can't give you better input beyond that the Prius v will have a bit more drag, but also a bit more momentum due to weight difference.

 

Far more knowledgeable people here, but I don't think she will be able to stick head out of the moon roof.

 

Well, I think Reachk was more referring to an actual open window in the back or none at all with the cargo area. I know with the Prius v, there have been people recommending the dog hammock accessory. If you are a dog owner, the two options have always been either a kennel cage enclosure in the cargo area, which no one has a window opening or rear seat area with the window open (Some will also drive with the dog in their lap (REALLY BAD IDEA) or in the passenger side seat).

I would be a bit hesitant to have your dog sticking its head out the sunroof, but then again, the likelihood of something particularly nasty happening to them on the roof part is as likely as sticking their head out the window. The only other con is the ability to do so without causing some obstruction to your rear view mirror. But again, up to you how you want to keep your dog happy. The solar option, however, would be a better choice for keeping the car ventilated, however, since the Prius v does not have that option. I will say, though, the Prius will also have more 'radiant' reasons for needing the ventilation, as you have 2 greenhouse like glass areas (Windshield and rear window) versus the Prius v.

 

Enjoy your Prius v 5. I know after 7+ weeks with my car, I have been enjoying it, only 2 fuel ups so far with the car. Also, be mindful of the weather, if it is a bit chilly, don't be surprised if your mpg is a little lower than 40, as my first fill up was around 33 and even in California, there are some cold times.

Take some of the driving tips from catgic's link I have in my signature, it helps out a lot in getting the most out of your car's mpg.