I have both. Started with a laramie loaded up, bought off the floor. My second truck I ordered and wanted the same exact truck. BUT, a dealer friend convinced me to go with the Limited I then ordered. It was a little more $, but he convinced and proved to me that when I trade, which I do often, the Limited will save me about $3K because of resale of Laramie vs Limited. According to him, they do not care about options, just model.
I have air on both, and really like it, so I don't know about springs, but most have said they are just as good ride, just not adjustable heights, which I use quiet often.
My Laramie has 18's which I prefer, my Limited has 20's which are OK, but I like the 18's better. I would never own 22's in pothole country.
Best of luck