How much of a difference is there between these three car sizes? We're going to be visiting family for 12 days and decided to rent our own car for the first time since we'll have 2 car seats and it was already difficult to manage sharing cars with my parents with 1 car seat.

Right now we own a 2-door car (although it's a beast) and a mid-size SUV, so these car sizes mean nothing to me!

The price difference in the top and the bottom is $30... am I actually gaining much space by sizing up? I'm certainly not opposed to spending an extra $30 if it's worth it, but IS it worth it, or is the smaller car just fine? It's really just to get us from point A to point B - we're not traveling with a ton of gear or anything