I had a C280 2 yrs ago. Starmark certified when purchansed. Sold to my sister. Just bought a '93 300E for my Dad. Interior is about the same size. The 280 has better interior feel but the 300E's ride feels more solid.
Six and half a dozen....
Like they said, I think the C280 is just a hair better and probably easier to find a low milage one...

Anbody know where I can find a servcie manual for the C280?

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93 300E (for DAD)
06 ML500 (rides like a truck)
99 E320 (sold, wife didn't like the dings)
98 C280 (sold to family)