Both are very nice resorts. You can't lose with either. I have stated at HGVC and toured MGV. The Marriott is newer and beautiful. If you like golf at all you'll want to choose the Marriott as it has a course and an entire institute. the Marriott is larger. The Hilton has a on-site theater and a crouqet court. the largest pool is not heated. I liked the Hilton location a little better and the size of the resort. You could actually walk to seaworld if you wanted to. The Marriott is fancier. I guess i would choose it because i haven't actually stayed there yet but the Hilton would be fine as well.