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I would say all the ATT models top to bottom are the most popular, or at least the hardest to get. That is a result of a lot of them being shipped out of the country & those that are not leaving the country were picked over VZW for a number of reasons.

VZW iPads seem to be the most abundant & therefore least popular for now.

Of the wifi only models, I think the popularity goes from the bottom up with the 16GB being the most popular followed by the 32GB & then the 64GB.

I'm not going to hyper analyze based on colors, but I would guess black is more popular than white.
 
Thanks to being GSM models, AT&T are in hot demand all colors and sizes.

I see that the wifi ones especially 32GB and lower capacity are selling well in South Jersey, as all the Targets, Wally's World, and Best Buys in a 50 mile radius are always sold out, expect, when a limited availability pops-up and it is quickly bought.

The Verizon ones are the ugly sister of all 18 UPCs/SKUs because they're CDMA, I really wanted AT&T, but 90% of my travel is to Puerto Rico which has CDMA coverage, I "settled" for the 64GB White Verizon model.
 
Thanks to being GSM models, AT&T are in hot demand all colors and sizes.

I see that the wifi ones especially 32GB and lower capacity are selling well in South Jersey, as all the Targets, Wally's World, and Best Buys in a 50 mile radius are always sold out, expect, when a limited availability pops-up and it is quickly bought.

The Verizon ones are the ugly sister of all 18 UPCs/SKUs because they're CDMA, I really wanted AT&T, but 90% of my travel is to Puerto Rico which has CDMA coverage, I "settled" for the 64GB White Verizon model.

Man, you're lucky because that's the EXACT set-up I'm looking for. But both Verizon and AT&T are extremely popular in my area so I can't find either.
 
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