Scottsdale Quarter is basically the newer mirror counterpart to Kierland Commons. I typically wind up in both locations more often than not. The Quarter has many of the same types of shops but it does boast The Apple Store, Restoration Hardware, Sephora among many others. As you'd expect there are also a number of good spots to grab some drinks or a bite to eat, though I do prefer Kierland's offerings better. One thing I do enjoy is Press Coffee Roasters, which is a fine spot to grab an Americano or a cold brew.
The layout is similar to Kierland but feels a bit more open and the commons area with a fountain and a nice seating area for families or just hanging out. The parking situation is similar to Kierland; if you can find a spot on the "street", fine, but it does benefit from a parking garage if you don't want to be bothered hunting around.
Scottsdale Quarter is worth a look if you'd like to do a little strolling, window shopping or just relax in a nice setting. The weather is getting better again, go have a look.