Without actually looking at any of them it is impossible to make any strong recommendations. I like both Marlins and Winchesters and my preferences between them vary according to vintage and configurations.
Marlin: I like straight grips, so most of the later-model Marlins are off the table for me, but the 336 Cowboy and the 336T, Texan, would be an exception. The 1893 Marlin was made in 30-30, and is particularly attractive.
Winchester: With the Winchester 1894/'94 and its variants, well, there are so many out there is would take a whole book or perhaps library to describe them thoroughly. I definitely like the pre-'64 models the best, but there were some good later models. It depends on one's aesthetic preference to a large extent. In the carbine configuration, I especially prefer those that were built from about 1937 to about 1948 with the longer forearm-wood and checkered hammers. After that time period, Winchester began to switch to a cheaper serrated hammer, and within a couple more years or so, the forearm was shortened. Somewhere in that time frame, the flat version of the front barrel-band showed up for a little while. In the rifle configuration, the model 1894 that I like the best was given a different model number altogether, that is, the model 55. Originally, this model was a take-down version of the model 94, with a short magazine and, "shotgun", butt; later production also offered a solid-frame, which I prefer.
The most important thing I have to add is this: Learn the fine art of haggling.
"I like these two older Winchesters you have here, but they aren't 30-30's. I'm really looking for a 30-30 that looks like these. Yeah, but those 30-30's aren't like these two 32 Specials......if the ammo was easier to find and didn't cost so dang much......Is the price on these 32 Special firm? They're kinda over my budget.... Where do you think I can get ammo for it?" And after a while, you might find yourself with a 32 Special instead of a 30-30.
But be willing to walk away. There are a lot of them out there. I paid $275.00 for a 1942-vintage model 94 carbine not long ago, that someone, a long time before, installed a recoil pad on it. Because it was slightly altered, it was deeply discounted. So I lengthened the stock with a nice piece of Cherry wood that tastefully contrasted with the Walnut, at a length and angle that better suits me and topped it off with a slip-on recoil pad. It has become a favorite. I am still looking for an original metal butt-plate, and that will happen someday; in the meantime, with the addition of a vintage Lyman tang-sight, I'm enjoying the heck out of it.