Best 4G/5G mPCIe card for old GL-MIFI router?

I had inherited a old version (2-pin battery) GL.iNet GL-MIFI with EC20-CE HCLG card.
Updated its firmware to the latest GL.iNet firmware.

I am now in SE Asia, what will be the best mPCIe card I could replace the EC20?
or best card still EP05 LTE-A cards? 300Mbps, instead of 150Mbps with EC20.

What about WiFi?

Best Celluar data performance is my intention.

You can use EP06-E module.