What do you want to use it for? I've been wanting a lever action for awhile and was focused more on the 30-30. However, I decided that, since I wasn't planning on hunting with it but rather just using it at the range, I would do better to get a .38/.357 so I went with a Marlin 1894. I have two .38 revolvers and am setup to reload .38, so it was a perfect fit. It's also ridiculously fun to plink with. I'd bet that a lever action chambered in a pistol caliber will follow you to the range much more often than one chambered in 30-30.
EDIT: Also, .38 out of a rifle has very little recoil. As such, my wife really likes shooting it. That can be a pro or a con, depending whether or not she feels like sharing. "Hold on, I'm just gonna shoot one more tube full.....okay, just one more tube....I promise, this is the last one....do we have another box of .38?"