Visible is a deprioritized version of Verizon's cellular network, so when your on a busy tower you will see slower speeds than postpaid Verizon Wireless customers. Verizon also happens to have the slowest network over the last few years since they have the most customers using it (nearly 130 million users) and smaller spectrum holdings than the other two major cellular networks.
T-Mobile is using dedicated (and much larger sized) low and midband spectrum for their 5G connectivity, plus they have almost half as many customers, resulting in much faster speeds.
That being said 5G is still in its infancy, 5G Standalone is really needed to lower your phone's power use (so its not connecting to LTE and 5G at the same time), reduce latency and jitter, and allow 5G to stretch further for a more stable connection.
Visible is a deprioritized version of Verizon's cellular network, so when your on a busy tower you will see slower speeds than postpaid Verizon Wireless customers. Verizon also happens to have the slowest network over the last few years since they have the most customers using it (nearly 130 million users) and smaller spectrum holdings than the other two major cellular networks.
Verizon also chose to deploy 5G service using spectrum sharing, so 4G and 5G speeds are very similar: https://www.zdnet.com/article/verizon-5g-dss-isnt-the-5g-you...
T-Mobile is using dedicated (and much larger sized) low and midband spectrum for their 5G connectivity, plus they have almost half as many customers, resulting in much faster speeds.
That being said 5G is still in its infancy, 5G Standalone is really needed to lower your phone's power use (so its not connecting to LTE and 5G at the same time), reduce latency and jitter, and allow 5G to stretch further for a more stable connection.