Interesting 20:1 in Europe as not so in the USA.
My guess is mostly diesels in Europe
210 in USA had rust problems that the 124 didn't have.
124 global production was 1M more than global 210 production
That's hardly surprising if you consider the 124 chassis was sold as a coupé, cabriolet, saloon and an estate/wagon.
Also, wasn't the 124 'life cycle' quite a bit longer than the 210? 124 started in around 1985/86 IIRC (C-plate in the UK), and was generally sold until around 1996 - so easy 10+ years. W210 came out around the same time as 124 sales ended, and was sold until the launch of the W211 - 2002/2003? So about 7 or maybe 8 years.
I imagine if you adjusted those figures to include sales of say the '202-based' W208 CLK cabriolet and coupés and the shorter sale period the W210 sold pretty well in it's own right.
I like both 124s and 210s. The 210 is technically the better car, rust aside. But tbh this can't be overlooked!
I think people will always have a fondness for the 124 model. You don't seem to get that with a 210. They're just a car.
The 210 is from an era of new technology. When cars started to become obsolete quicker and were not built for such a long haul.
Yep they might cover great mileages and be durable/reliable, but I don't get the feeling Mercedes intended the W210 to be around forever. The electronics and rust will see to that.
So it's a pre-facelift 124 that wins the ultimate 'quality' award for me, but if I was looking for a cheap usable E-class nowadays I'd look for a sub-£1k W210
The W210 really is tremendous value these days