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Not really sure... now that I have tethering I could use the WiFi model in various places with AT&T coverage, and I'd probably go through that storage pretty quick. But I already have access to a 64GB iPad 1 and 128GB Mini 2, both cellular, so I'm not interesting in getting another one.
 
Have 5GB tethering with my phone plan so no need to spend an extra $120/year for celluar service and $130 more for the celluar version. I always have my phone with me, so no need to have 2 celluar devices with me. Most places I vacation have Wi-Fi.
 
If I had to choose I would go with the Cellular 64GB option. That said, I went with the 128GB Cellular Air 2 this year for a change.
 
Forced to choose between the two, I would go with the 64GB LTE version. I don't need 128GB storage, and would gladly sacrifice that storage for LTE should I need it as some point. That said, I went with a 64GB Wifi model as I have the ability to tether to my iPhone 6.
 
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