Ok I'm going to update this thread to a Designers Jean Guide
I'll add the comments so feel free to add some of your favorite characteristics for your favorite jeans.
Hopefully it will help others too.
Diesel = Construction/Durablility
For me it was easy to choose Diesel because of their construction. Just trying on a pair of diesel's in a fitting room was enough time for me to figure out their quality.
The double stiching and fabric is so durable...