The 89-91 had a nicer interior.

I'd look for a 560SEL, they are nicer, with self leveling suspension, heated seats (4), burlwood trim, and the reclining back seat. Mileage is about the same.

Also, the 560 commanded quite a premium when new, so it's reasonable to expect the person who bought the 560 to have taken better care of it. While he may not still own the car, the better care initially may still make for the better car used.

For 1991,
MSRP 420SEL: 63,600
MSRP 560SEL: 75,100

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles