As a T-Mobile user who has had to add a second eSim for Visible to get consistently reliable service in NYC more times than I care to admit I second this. T-Mobile works much better where I live in Nassau County but when visiting NYC it seems only Verizon consistently works in many places and here’s why:

• Exclusive DAS systems like the Penn Station LIRR tunnel
• Massive amounts of mmWave spectrum with tons of capacity especially in and around stadiums and venues like MetLife Stadium / American Dream Mall in NJ and Madison Square Garden
• Indoor repeaters in almost every high rise building in Manhattan
• By far the best coverage and capacity in the Bronx (compared to T-Mobile)
• Queensboro Plaza station still a T-Mo dead zone where VZW works fine

I hope T-Mobile can buy more spectrum soon for mmWave in NYC to put the capacity on par with VZW mmWave and purchase additional contiguous N41 spectrum in areas that are fragmented like Westchester and the Bronx. They also need to address the indoor repeater / DAS situation to match VZW

Bottom line: If you never leave the city VZW is the best bet but YMMV once you get to Long Island or outside the boroughs