I was thinking the same way--take the most expensive one and then there might be an option to swap to a less expensive model and pocket the difference.
While I did not check prices exhaustively, a quick look suggests it probably would not work as a financial transaction--the costs are too high. So the bottom line would be to pick the one you really like.
If you are lucky enough to get one as a giveaway, make sure it is labeled a gift--otherwise, Uncle Sam will want his cut.
I did not really check out the prices, and wrongly assumed that the Tesla would be the more expensive of the lot. If one does not consider the prices, I would probably still go for the Tesla, for I have a hunch, even though it's a newer Tesla model, that it would have better support and reliability. But if you had included the 2017 Chevy Volt in the free giveaway list, I would have chosen it over the other vehicles because there would be zero range anxiety, and just a wee bit of guilt about the environment.That darn Uncle Sam is everywhere.