I dont know about Next. I have Verizon Edge with 5 users. For me Edge is superior since it is cheaper.
For example, I have 10GB data for $80, which means $16 per user. With verizon edge, I am paying $27.08 for each iphone per month and $15 monthly access fee. So per user, the cost comes to $16 + $27.08 + $15 = $58.08. Over 24 months, the cost will be $58.08* 24 = $1393.92. I did not have to pay any upgrade fee, any activation fee or any $200 initial up front.
Now if I had to buy in 2 years contract, I would have to pay $200 upfront for each iPhone 6 and $30 upgrade fee. Monthly it would have been $40 access fee with $16 data cost per user = $56 per month. So over 24 months, I pay $200 + $30 + $56 * 24 = $1574. More expensive on 2 year contract.
Plus I can easily upgrade each year. Just pay off remaining balance on my phone with cash, sell my phone and upgrade with $0 at initial and the cycle repeats.