If the driving into town from the East KOA isn't an issue, it'd be my pick of the two. A bit less traffic noise, more trees. Sites on the west end of the CG look nice, but I haven't actually been in there. That's my take from driving thru Wilson's and seeing KOA from the road.
Wilson's is a _lot_ nicer than it was pre-2004 flood, but it's located by a busy street, and right down an embankment from I-240/I-26. Even tho' it's close in, access to 240 East (downtown) is problematic. It does have good access to city parks, a dog park, and the River Arts District, but the main riverside greenway runs right thru it. This may or may not be a security issue, I have no idea.
You might also want to look at Mama Gerties if you're not bothered by hills and trees with squirrels. Bear Creel CG rates a thumbs-down from me because the staff was extremely discourteous the one time I visited.
I'd suggest looking at all of them with Google Earth.
Jim, "Do not meddle in the affairs of cats, for they are sneaky and you sleep with your mouth open."
'06 Tiger CX 'C Minus' on a Silverado 2500HD 4x4, 8.1 & Allison (aka 'Loafer's Glory')