i have both, but they are more than 20 years old and still chugging along. the marlin model 60 is slightly more accurate. the ruger is easier to reload. i prefer the ruger myself.
a word of caution, marlin was taken over by a group that owns remington and others. these new marlins and remingtons seem to have gone down in quality and up in complaints. do your own research and purchase what you like.
ya only got 1 arm and ya carry 3 guns for Christs sake. Well I don't want to get killed for lack of shooting back.