What do you want and what have you come to rely on in a marten lure?

I like skunk, and a lot of it, in a base that is waterproof and does not freeze. I make my own and it has quite a few other odors, and a base that has a permeating odor of its own, but the skunk in it is powerful enough to smell at 50-100 yards with a human nose. All that being said, I tested a marten lure of Bob Jameson's last year, and it didn't have any skunk I could smell, had a minty, sweet odor to my nose. (the wife certainly liked it better) and it is the only marten lure I have tested that performed as well as my own concoction.

After you get an odor they like, in a form that is waterproof and freezeproof, my next preference is a sticky, smearable lure. I like to take a stick and dip up a gob of lure and smear it on the tree above the box or pot, and have it stick there without running. That is quite a ways behind the other requirements though.

A large chunk of good bait in the box is what works here.
I never use scent lure for marten.
Location of boxes on the travel\dispersal routes is also more important than a scent lure when targeting dispersing juveniles as opposed to resident marten.

Best lure is catching another marten and having it loose it's bladder and glands when it dies. Like Boco said, location is more important.