I am an Marlin fanatic, so I am going to say Marlin...
Here's why:
Marlins are much simpler to disassemble for cleaning and repair. They are a very simple actions with minimal parts. It is solid topped and side eject. They have a good support for after market parts, sight, etc and they are made in the USA.
In all fairness to the Puma, it is a solid rifle. The 92 action is solid and it looks like the new Pumas are being build in Italy. I did not see a SS version on their website, but that doesn't mean they don't offer one. The price seems pretty high, but I have not looked at the 92's for sometime.
I would pick the Marlin, but I would suggest going to a good gunshop, handling both and picking the one that fits you the best.
Good Luck,
Matt