A wired connection is better, of course, because it has less loss of signal sources than a wireless connection
For wired connection, the width and stability of the data conveyor belt of the LAN access device under each router will be consistent.
For wireless connection, the bandwidth of each device connected to and placed on the LAN under each router is only half of the main route. If the device in the LAN under the lower router is used to play games or apply programs that require network integration, wireless bridging is not recommended. Use a wired connection whenever possible.