Cellular service in Mexico

So I’ll be traveling to Mexicali, Mexico in December. I’ll be there for about 14 days so I want to get a prepaid SIM card to use with my unlocked iPhone 7. I want to ofc, make calls there and also be able to make calls to the U.S too.

I only know of three options, Telcel, Movistar, and AT&T. Which one of these has the best service?

EDIT: Thank you for everyone who answered my question! Really helped me narrow down which service I’ll be using! :D