jugar

Asus' ROG 5's works very well on T-Mobile.  I wish the Xiaomi Black Shark's were more T-Mobile friendly though for 5G.  They work, just not as well as the Asus model due to band compatibility.  Ultimately, it depends on what you are looking for in a gaming phone.  Performance in games, you might want to consider Xiaomi because their devices run a lot cooler than the competition while maintaining their peak performance.  If you want a better 5G experience, I would go with one the ROG 5's.  If you want to use the device very long term, the ROG 5s with 18GB of RAM stands out. 

Anything else, I wouldn't really consider outside of the non-gaming focused devices sold by T-Mobile.  Most flagship devices will perform well in games.  Just look for devices without heavily skinned and bloated UI's.