I have many back up phones
NOkia 635, Samsung Light, Moto E.
Go with the Moto G
Windows is...meh
I got bored and tired of it.
I feel like windows is worse than apple.
You're limited plus their aren't enough apps, you get bored of using the phone quickly.
Moto phones are vanilla android or w/e you wanna call them. It's clean, no bloatware so it runs really well.
Avoid Samsung, full of bloatware and their interface is terrible and bogs the system down.