What’s the best 4G network in Shenzhen

Now Shenzhen   |   September 2, 2021

4G network is quite popular now in China, also 4G launched in Shenzhen. Who knows which one is faster? Is China Mobile or China Unicom or China Telecom? Also Who has the better 4G coverage? Are they both real 4G LTE mobile networks? I roam a lot in Hong Kong, who has the best 4G LTE roaming on Hong Kong networks?