I like driving both. I use the W126 560SEL for most daily driving until it's snow that I would swtich to the W140 coupe more due to its' traction control and heavier with snow tires get better traction. The W140 is noticably quieter due to the thick double panel windows and keep the heat out better in the summer and the rest button keeps the heat in during the winter. I would say I spit the time 65/35 with both cars.