Which is more suitable for traveling in the UK, renting wifi or using Unicom's CUniq card?

Of course, the CUniq card of China Unicom is suitable. I chose it after various comparisons, and I can't go wrong. It is the best choice to save money and travel. His home mainly does not involve roaming, and there are several options for the British traffic package, the cheapest one is only 5 pounds. In addition, there are European data packets and China data packets. Asia-Pacific data packets can be ordered separately, and can be ordered again if necessary. There is no pressure to roam in minutes ~