Wifi vs Ethernet Cable

What is the best way to connect the Raspberry Pi gateway, WiFi or Ethernet cable?

At the moment I use my house WiFi, but as soon as the tags moving, it seems that communication between gateways or the decawave Web application lost communication or info as if the system suddenly stops.

I run an application on a seperate Raspberry pi to get the mqtt info and save the coordinates in a sql database and switches the IO pins according to predefined locations.

I didn’t try the cable option yet. Any advice will be appreciated. Must I rather setup a separate WiFi network only to handle the communication between the gateways and the RPi with my own app?

Thank you on advance