Gosh Guys,a I very respectfully disagree.
The question was, which rifle is more versatile. But, he did not say, more versatile for what.
For, hunting, no question that he answer is the .30-30.
But, as an all-around rifle, for plinking, target shooting, home defense, training women and youngsters, killing varmints from ground hogs to coyotes out to 125 yards, killing deer out to 100 yards, all with readily available factory ammo in boxes of 50, all with less than half the recoil and half the noise of the .30-30, there is no question that the .357 mag marlin is more versatile.
Yes, I know, that if you hand-load the 30-30, you can come up with loads for all of these activities, but personally, I think hand loading is a drag, and I would not want to spend an hour or more hand loading 50 rounds of .30-30 when you could just pick up a box of factory .357s and go?
And lets not forget, ther .357 rifle will also shoot .38 special and .38 special P+, again in boxes of 50 at any Wallyworld. The Remington core-lokt 158 grain round nose soft-point .357 mags, and the core-bon 180 grain loads, are very effective on deer out to 100 yards.
I will guarantee that if the poster of the question buys both rifles, he will end up shooting and enjoying his .357 rifle 10 times more than the .30-30. And, If he needs to shoot a moose, he shouldn't be using a .30-30 anyway. The absolute cheapest item he would have to buy if he went on a moose hunt would be a used rifle in .30-06 or .300 mag. Excellent used rifles in these calibers can be found at any gun show for far less than a new Marlin 336.
Just my opinions. Didn't mean to slam those who love to hand load. (It gives me a migraine headache.)
Best Regards,
Mannyrock