It it's convenient, I prefer Ethernet. Ethernet is a lower-lever protocol, so it often works even when WiFi won't. And, Ethernet is faster and more secure. If Ethernet is not convenient, such as due to location, then I'm happy to use WiFi.
If given a choice, do you prefer running your system over wireless or ethernet for your network connection For more questions regarding this contest, please visit the Information Page here.
DS 07/25: You prefer to run your system, over wireless or ethernet network 
connection?