Hi M. - It is so hard to leave your little ones in the care of someone else!
As I read through your request I immediately thought it would be a better choice to leave your son is the first one. It has a seperate area for babies, which is great when they are learning how to walk (older kids aren't plowing over them) and it keeps some of the older kids out of the young kids faces. It would be good for your son to be with more kids that are his own age( or closer to it). AND..you do not want to have two daycare workers for 12 kids! THAT'S CRAZY!!
If your son is having a hard time, which he may when he first starts daycare, you will want him to be able to be cuddled and loved. If there are too many kids, they may not be able to soothe him as he needs to be. Less kids means less noise. Nap times.
The time in the car is really not that big of a deal, I think. It will give you time to talk with him on the way home (granted he wont talk back, but he'll get to hear your voice!) and time for you to decompress before you get home and it's time to get dinner, bathe, laundry, clean up...
I would choose the one a bit farther, but with less kids. That one sounded better to me. BUT, if it's kindercare, I would say NO NO NO NO NO! But that's just me!
Good Luck mama...it's hard
L.
Mama of two boys (3 and 6) and personal nanny of one girl(2)