I drove 123's for over ten years and 124's for over 10 years as well.

The 124's are far more comfortable to drive and ride in. Handling is far superior to 123's.

The 123's are easier and less expensive to mantain, possible better built too.

I wish I found the 123 more comfortable but after I drove a 124 I was no longer happy with the comfort and handling of a 123.

I also prefer the 123 body style.