The moto G will be a nice, fast phone and affordable. Perfect for the 12 year old if you are on a budget. Do not worry about the "Specs", worry about overall user experience. I am sure there will be plenty of reviews soon..
The Moto X is one of the nicest phones in existence and is not anywhere near the top on specs. Smooth.
The moto G will be nice, fast and will have a great user experience. I bet it will run smooth as silk. Perfect for a kid that age.
And if they break it, you do not have shed tears at that price, unlike the $550+ range phones.
Toss in motomaker and the fun of personalizing the phone and I think your kid will love it.
I would like to get my 13 year old daughter one, but I am on Verizon. We do contracts and are not pre paid. I am hoping there is a way to get one for her.
Motorola under Google is taking innovation and customization to the next level. They are not low end junk, they are quality. At a good price.
Also, check out the Motorola radios and signal strength.
Durability. Quality. Price.
In my opinion, the "new" Motorola under Google is hard to beat. Look deeper into in then the spec sheet or you will be missing out.