5G is all about the infrastructure. Yes, it is faster, but it is also much shorter range, meaning a huge new set of cell towers need to be built, since the cells will be physically smaller. It's biggest advantage is that it offers the potential for wireless to leapfrog the performance of DOCSIS & DSL, making it the preferred choice for fixed-location customers.
It is going to take a few years for the 5G infrastructure to be built, so it is really not a consideration for buying a phone today.
And don't believe the liars at AT&T who are trying to market 4G as "5GE":
https://www.wired.com/story/sprint-s...l-meaningless/