I loved Uncharted, and I loved Jak & Daxter. I'd probably prefer a Jak 4 at this point, just to see the franchise transitioned into HD, but I'd be fine with either.
Going by ND's various hints, etc., we'll most likely see Uncharted 2 first.
But who knows, we may see both. Ready at Dawn was founded by former Naughty Dog employees, and there have been rumors that their next title will be a J&D on the ps3.