I went with Tracfone 6 months ago and simply love it. I got the Samsung Galaxie J3 for $99, ( which is currently going for $69). I bought a 365 day prepaid plan for $125, which works out to $10.42 month. I don't make many calls or used much data.
I'm surprised that the T-Mobile pricing structure isn't mentioned at all. Sprint charges a lot for taxes and fees while T-Mobile absorbs it (as it should be). Advertised prices should be "all-in". With Sprint, you pay close to $10 extra in some areas.
Searched for the least expensive cell service for my spouse who rarely uses her telephone. Used Tracfone for a year, and then learned about Red Pocket Mobile. Couldn't be more satisfied! Price, customer service, reliability - everything - is great!
You left out one critical aspect: Customer Service. Having been with T-Mobile and now Consumer Cellular (for the last several years), my experience has been that there is absolutely no comparison. Consumer Cellular is fantastic to deal with. My time with T-Mobile was anything but!