I have both, and both shoot equally well. As has been said, the Winchester is a little bit lighter, but the Marlin design is more suited to a scope, should you want one. I don't like scopes on lever guns so mine all wear irons, but that is a personal thing. One of the things I like about the .30-30 is that it gives full power performance with either jacketed or cast bullets. Should you use cast like I do, there are a couple quirks you need to keep in mind. The Winchester has standard rifling with a 1:12" twist, and is easy to get cast to shoot well in, while the MArlin uses a 1:10" twist. My Win slugs at .308" and I used to use .309" and get factory load velocities and good accuracy with no leading. When I got my Marlin, which also slugs at .308", and tried to use the same .309" cast bullets in it that I use in the Winchester, I got a badly leaded bore and no accuracy. I had heard about a lot of stories about the Marlin not being suited to cast shooting, but had to experiment. I now size the same bullets to .311", and both rifles shoot them equally well, with 2-3" 100yd groups being standard, and no leading in either rifle, and I get a chronographed 2250fps out of the Winchester and 2230fps out of the MArlin, using the same 170gr cast bullet in both. I have been told that at one time or another that each rifle is stronger than the other, depending on the speakers preference, but I really don't think either has enough advantage to actually matter, if either does. Both are good accurate rifles that shoot well, and it is just a personal preference as to which is "better".
And I believe that leverguns are more common in patrol vehicles than most people would believe. I know at my department, when there is an issue with a semi auto rifle going down for whatever reason, just about everyone reaches for a levergun, with .357 mag, .44 mag, .45 Colt, and .30-30 Win having been kept in our vehicles at one time or another in the last couple years. Now we go back to the semi's to keep the city happy, but still don't hesitate to grab a lever if or when needed. I will gladly go for a lever instead of a bolt gun anytime the range is limited to withing what the levergun is capable of, and especially when speed is important. Now the bolt gun will always have the range and usually the accuracy advantage, but it is a much slower and more deliberate weapon than the levergun, which can be slow and accurate if the shooter slows down, or can be VERY fast into action. I have no doubts that a .30-30 lever-action is perfectly suited to deer hunting out to about 200-225yds, and trust it against a human opponent out to 300yds, since the human body is taller and more forgiving of a slight range estimation mistake than a deer is.