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.
Wow. I've got 8GB high speed 4G for £30, and I had the phone thrown in for free (Pixel 2)! Incredible how data varies so much in price from country to country.