T-Mobile is by far, the better choice for global travelers. That's because they offer FREE text and data in over 140 countries. Mexico and Canada are considered local on all newer plans. Voice calling in these countries ranges from $0.20 to $0.30 per minute compared to up to $5 per minute with other carriers. No need to call the carrier to ad "bolt-on" roaming plans either.
You don't see those old annoying Verizon Wireless comparison maps anymore because T-Mobile spent $435 million on 700mHZ infrastructure in 2016 and $8 billion on 600mHZ infrastructure that is currently being rolled out with new devices to support it. That being said, if you drive cross country for a living, I think Verizon would still be my first choice.
As an independent professional wireless consultant, we make sure you chose the right provider and set everything up for a seamless transition. It doesn't cost any extra to get the red carpet VIP treatment from professionals as we are partnered with all the major carriers. Doctor wireless clients don't stand in store lines like peasants. That's because we take all the information over the phone and have your carrier of choice deliver to your home or office. Contact Dr Wireless for a free rate plan analysis.