Depends. The SEC is a big two-door with a full back seat and a huge trunk. More headroom, better sound system. SLC's are smaller and might be considered sportier. The SEC's seem to do better price-wise, probably because the SL crowd likes to take the top off.

I think that the SEC's were the most expensive cars by MB offered when new.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe