Does ATT charge deductable if there is an electornics issue without damage. I hope not.
AppleCare+ advance ships a new device or you can go to local Apple Store and exchange the device for any number of reasons for no charge. $49 only if there is damage.
So over 24 months you pay $68 more for ATT Mobile Insurance + $199 per lost/damage incident.
Unless you expect to loose phone, AC+ is better than ATT MI.