I have both... Have had 114.. 115 and 123 Coupes. (123 sold two weeks ago) . 123 was diesel.. and now have a 92 124 coupe.. My wife and I both feel the 123 is the best car to drive.. We live in the high country and have endless miles of twisties in our roads... The 124 is fun but kind of like driving a Honda.. A cute little run about..
When we go on a trip we take my 123 300 TDT It has a far nicer ride and far better comfort.. But then the 124 coupe is kind of nice for running around town and short trips.. Kind of a toy...
Ken