Just my experience, but it's much easier to get close to a big mulie than a whitetail. They are just much more timid. I think part of that has to do with the terrain I have hunted for both. The mulies I hunt are in the Texas panhandle and there is little cover, just cedar trees and canyons. Lots of spotting and stalking, but if you put in the hours, you'll find them.

I hunt whitetails in areas with tons of cover and they are just harder to find. Being so fearful of humans, spot and stalk hunting is much tougher and it's best to hunt them from stands or sitting still near known travel paths.

So, I voted 24 inch whitetail as I've almost killed a 30 inch mulie (29.25 spread).