Does it matter if I use Wi-Fi or Ethernet?

My iMac is right next to the modem for my internet connection.  It has Wi-Fi and an Ethernet so I plug it in.  Is there any benefit, improvement in speed or otherwise to plugging it in with the cable?
Thx!

If a wired connection is available and convenient, as it can be with a desktop Mac, use it. Doing so will avoid all the potential problems with wireless networking.
Leave Wi-Fi enabled if your hardware is capable of AirDrop and you need it.
To give precedence to Ethernet, open System Preferences > Network, click the "gear" icon and select Set Service Order... Drag Ethernet anywhere above Wi-Fi, click OK and then Apply.

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