RPM. Ah the choices we are forced to make.
I am small boned so the Winchester feels better to me. The Marlins feel a bit clubby. Accuracy wise, they seem to be about equal. (I have both Winchester and Marlin rifles.) If a scope is absolutely necessary, both rifles are now set up to be scoped. The earlier (non-angle eject) models need a side mount which I detest. Fact is I detest scoping any lever action. It looks like hell, changes the balance, and is just plain clunky, to me.
If you should want to use cast bullets in your 30-30, the Winchester is easier to make shoot with accuracy than a Micro-groove Marlin. (I did some experimenting a few years back with cast lead. I can duplicate 170 gr. factory in my 30-30's, including accuracy, and bullet mushrooming.) I no longer use jacketed bullets in mine.
I guess my best advice is to pick the one that feels the best to you. Unless a scope is absolutely necessary, I would put a good receiver sight on it, sight it in and forget it.
Paul B.