my w123 has more road feel than the w203 which is cool. Having said that, the c class sedan would run circles around the wagon in most if not all driving situations. Been in both and had to make emergency type maneauvers. I trust both nearly equally; I'd give the w203 a slight nod except that I typically drive the thing 15-20 mph faster than the w123...

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)