I was a hater on the Henrys until I picked up an Ithaca, which is the same design made in West Germany in the '70s.
It's lightweight but feels solid, accurate, and smoothest lever I've felt on a levergun. It's far smoother than my 1953 Marlin 39A. The basic Henry goes for $200 at sporting-goods stores in TX, and that seems about right.
The Marlin is a lovely piece of solid walnut and steel. It's notably heavier than the Henry, feels like a centerfire rifle more than a .22.
I'd imagine that the Marlin is more durable than the Henry, and has been made almost unchanged for over a century.
However, the Henry is smooth and light, historical looks with modern guts (designed by Mr Imperato, father of the current president of Henry), and it's far easier to find a Henry carbine than a Marlin Mountie. Marlins, both full-size and Mountie, go about $350 used online, as low as $250 in a pawnshop or gunshow if you're lucky, but I've only seen a used Marlin 39A once (and bought it).
In the interest of full disclosure, Mr Imperato is donating a Henry lever-rifle to the UT Rifle and Pistol Club. I still feel that my opinions are fair, and our club members have been having tons of fun borrowing my Ithaca, so it's not just me.
Both are good products, just very different conceptually.
-MV