I started in Pallet Town, but I'm gunna go with Littleroot, just because...well, I have played RSE more than any other main series game. I've started countless journeys with Littleroot as my starting point, so why not pick it? Plus you have to ride in the moving van on the way there. Funny.
Edited your poll, since you didn't even know the name of the Unova starting town, which I found odd considering it's your favorite. At least take the time to know what you're talking about if you're going to make a poll.