They are both excellent cars, the 300SD is by far the better around town car.

So what if it has a 14 head? Most of the 603's out their probably have the original head. Don't do something stupid like neglect the cooling system and overheat it.

I don't know what "gadgets" you are refering to they are pretty much the same car...oh wait the SDL has tilt on the sunroof and memory seats...not what I would call a complex car. These days the W126 is about as complicated as your average garden tractor.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200