The Ruger M77 is a very well built rifle, controlled round feed, heavy claw extractor, and a blade style ejector. Some people like this set up, some don't. I find this type of Mauser set up makes working the action not quite as smooth as say a Remington push feed, or Tikka or Browning, but it works and is very reliable. But to qualify that, I have never experienced any problems with any brand of push feed.
I was shooting a friends newly aquired M77 Hawkeye yesterday, chambered in 358 winchester in a stainless/synthetic version. Very nice handling rifle, light and came to the shoulder very naturally, and it shot very well too!
I would not hesitate on a Ruger M77, in fact I think the stock ergonomics are one of the nicest in the industry. I can not speak about the Marlin as I have no experience with them, but by all accounts they are a decent rifle too. Good luck!