Two of THE most popular .22LR rimfire rifles in the world today.
I'd prefer the Marlin 60 to a Ruger 10/22 any day but it's all about taste mainly. They are both pretty good budget rifles and both are capable of awesome accuracy once you have spent money to improve them. The Ruger 10/22 has a very very basic trigger that can't be adjusted easily.
These two rifles have outsold everything else worldwide in the past 30 years + by a factor of 10 or more!
I think the Marlin 60 has been around for 40 years + which is truly amazing.
Then again I'd prefer a CZ or a quality Brit made rifle over a Marlin.
Pity that there aren't any British made options out there any more.... (R.I.P Webley & Scott, BSA etc).
I am a Brit afterall....