Verizon prepaid - how bad is it compared to postpaid?

Paying a ridiculous AT&T bill right and want to switch to Verizon.

Their prepaid is $40 per month. Drops to $35 with autopay. $30 after 3 months and $25 after 9 months.

Sounds like a sweet deal.

You use prepaid or postpaid or both? Any difference in quality of service?
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