Both nice areas but they are 3 pt bull. 601 is mostly private land. It has a good amount of logging and also can be quite swampy in areas. A bicycle helps you cover lots of ground. Nearest place to reload for food and gas is in Clallam Bay/Sekiu and I think most close down not long after dark. Tribe hunts that unit pretty good and they can take spikes and even a few cows get shot.
618 is mostly forest circus land, but there's a section in between FS, rez and national park (Queets River) that is DNR. It has some logging in the DNR stretch as well as a few gates and roads. The FS part has little logging and little road repair, also very steep. There are some gated FS roads, but they get pretty overgrown and if trying a decommissioned road---worse than just busting brush. The weather can get bad in there in a hurry, lots of old growth in parts that comes down in high winds. I've seen days where it rained about an inch an hour and the rivers come up fast. It is high enough to get a little snow, but does get ice. The ground is really crunchy with all the frozen alder leaves. Nearest store is Queets Trading Post. When the weather would get really, really bad I used to go camp over to the DNR part where trees aren't falling as much.
Both those areas seemed to take a beating when the rule was changed to allow bowhunters to hunt with muzzie tags, number of hunters went way up. This year those areas are probably going to take a real beating by the rifle hunters, a few camps I know of are moving to those two units because they are the only ones that don't have an early muzzle loader season.