I use Chester only while playing Wolfgang. I'd rather use my body slot for Hunger Belt/Armor. Chester is either for food or ruins stuff. I always transform him into the Shadow version.
Packim, though... I never use him. He sucks. 90% of the time he will get in my way and waste either my time of weapon durability.
Good equipment that can be repaired or isn't craftable in SW and plenty of gold I'd say. I don't know if there are items that can't be carried over or recipes that aren't available in SW but are in RoG.