Verizon is no more expensive for me than the T-Mobile/AT&T.
I know my plan is no longer available, but I pay $70/month for 450 minutes and unlimited data. 500 minutes + unlimited data on T-Mobile (with or without unlimited texting) is also $70/month. I use Google Voice for texting anyway, so that's not a benefit for me on T-Mobile.
But since Verizon won't allow me to keep my unlimited plan and get a subsidized phone any more, I'll compare it to T-Mobile's Value Plan, which costs $55 for 500 minutes and unlimited data. So, come August next year when my contract ends, I'll be paying Verizon $15 more for the same plan I could get on T-Mobile with the added coverage of Verizon and LTE.
If I got in on AT&T's unlimited data plan two years ago, I'd also be paying $70/month but I'd be throttled after 5GB.