I have both and made coffee for my parents in both of them. They said the Coffeemaster coffee was better. That was the first electric Cory but I don't think the thermostatic mechanism changed much because when I found the lower bowl in a big older hardware store with a forgotten housewares department in 1965, I wrote to Cory for information about it and about buying an upper bowl. They sent me an envelope filled with information (imagine that now) and the instructions for adjusting the thermostat in mine were basically the same except that on mine, the whole cover of the base of the brewer had to be removed to access the thermostat screw and the newer models had a plastic base with an access button you could remove to adjust the thermostat. I wound up buying the stainless steel upper bowl and the lock on lid from Cory.
Because the Cory does not send all of the water up to the top bowl, and because it does not have a hole in the stem, the water rises as it heats and the brewing when the water bubbles in the top bowl is usually for a shorter period because within seconds of the heat switching from high to keep warm, the coffee starts going back down unlike with the Sunbeam where it burps and gurgles and takes a while to return to the lower bowl. I think that makes for a fuller bodied brew, but the way the water rises slowly in the Cory also could give the grounds time for the flavor to bloom. Consumer Reports did not like any of the Cory brewers much at all and said they produced a brew with a lot of sediment. One hint they gave in the late 40s report was to substitute the Sunbeam cloth filter for the filter rod. Something interesting in the late 40s report was CU's amazement that the Coffeemaster they bought to test before WWII was still working well. They did not expect an electrical appliance to last that long, but there are all of those that are still working today so the quality was there from the beginning and only died at the end.
The Cory thermostat was very unreliable because it did not have the positive high temperature point when the bowl boiled dry like the Sunbeam and if it was set to give a certain amount of brew time with the water up top at 4 cups, it would shut down the high heat before all of the water had risen if you tried to make a full pot. I eventually turned it up so that the thing stayed on high heat and just timed it for a minute once all of the water was up. The Sunbeam C30B worked perfectly from the day it was given to me. I think the stove top Corys make better coffee than the electric models.