They're both probably fine guns for the money. If you can do a little research you'll probably find mostly positive things said about both guns. The XL-7 hasn't been around long but it seems to get good reviews. I checked them both out when I was looking for a new rifle this past year. I didn't buy either one, but it wasn't because I didn't like them. A different brand just worked better for me. Also, the XL-7 wasn't available in short action yet, which is what I was looking for.
Handle and shoot both if possible and see which one feels good to you. Price isn't a concern but if happens to be the Marlin put the money saved toward a better scope. As I always say hope I was some help and Good luck.