I have no experience with the Marlin, so I won't go there.
I have had a .17HMR Sportster for three years. I like it for Foxes, but it's too light for Coyotes. I have the BSA Sweet 17 scope on it, and they make a good pair. Range is my only problem. I can hit and kill a Fox out to 300 yards, the .17 HMR is only good to 40 to 45 yards for Coyotes and Lynx. I have Coyotes and Lynx come in to my calls on a regular basis, and they usually hang up at 50 to 60 yards, if I can not get them to come in a bit closer, I have to pass on the shot.
I also have a Savage 93-F in .22 mag. Same gun as the .17HMR. I like the bolt action 93-F due to it's weight and feel. I also like the magazine feed. In honesty it makes a better gun for Coyotes and Lynx then the .17HMR. Not quite as accurate as the .17, but it carries a bit farther. I can hit and kill a Coyote or Lynx on out to 100 yards, I haven't taken a shot at a fox with it yet.
I just bought the Savage M-25 Walking Varminter in .17 Hornet a week ago. That's the one with the synthetic stock. I like the Savage accutrigger, but am a bit unhappy that the magazine only holds four cartridges. I would like to get two more into it. Not sure yet myself what it's going to do to a fox, especially up close. Have not been out with it yet. My friend has one and says to make sure the Fox is at least 15 to 20 feet away before shooting it, and it's pelt friendly after that. He claims he has shot Foxes from 20 yards out to 200 yards with it One shot kills each. He did not want to talk about the one at 3 feet.
His partner told me an Arctic Fox had a death wish and came in on the run. They did not see it till it was 20 feet from them on the snow. They yelled, stood up, and made lots of racket to get it to stop for a shot. Finally my friend held out his rifle, pointed at the Fox and shot. The fox was 3 feet from the end of the barrel. Scratch that pelt.