The controversy over whether cornbread should be sweet or not will continue forever. Some say Southerners prefer cornbread unsweetened while their Northern brethren prefer a sweeter variety.
There is no right or wrong here. Try it both ways and decide for yourself. It's so darned easy to make, experimentation should not be overly taxing.
BTW, I use the East Coast Grill's cornbread recipe which is a sweet version and really like it that way. The recipe calls for a CI skillet but I use a SS one and get perfect results.
Enjoy yourself developing your perfect cornbread!
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan