TheW124 is known to be reliable and having easily available parts
If you plan on keeping it for a long time, I would get the W124
But if you need a reliable commuter car for the next 5 years, get the G4
Another thing, I woudnt have a W124 as an only car
If you can find a coupe...
Is it me or you could get a W210 for the price of a G4?
400k is a tad expensive for a W124