Verizon prepaid is also not a bad deal. 8GB for $50/month. You can get $5/mo off if you auto pay and $15 off for multi-line. It's going to be very hard for Fi to be anything other than a niche provider unless they improve their data pricing.

wait, what? I have T-mobile as well, and they told me that was the cheapest plan they offered. What is your plan called?