I don't have a .30-30, but I do have a 94 Ranger in 44 mag, and a Guide Gun in .45-70. The Marlin feels smoother, more solid and more substantial, has better wood (not a fair comparison though - Rangers have cheap wood on purpose), the sights are bad, but not as bad as the Ranger, but best of all, the Marlin came out of the box with a 3-lb trigger (a fluke?); the Ranger's is around 9 lb. Per Paul B., the Marlin's forend in particular is wider than the 94's.
If you plan to put a scope on it, the Marlin has a solid-topped receiver and proper side ejection that will allow you to put a legitimate scope base on it.