X-over at the amp or puy on "full" and use the HU?

That's how I have it set right now on a 12 slope. Ive thought about trying it the other way just to see if/what the difference would be. I was curious how everyone runs theirs and what was their best results. I feel I need to add something somewhere for a little better/cleaner sound on my mids. I have deadening on my doors (inner/outer skins) but I don't feel like i'm getting the "full" sound of them.