I received both of these wines as samples. Both these wines are in the $10-20 range. I think of the two, the Pinot Grigio is definitely more to my tastes. Floral, apples, honey, something verging on more tropical, crisp, and a minerally finish. Pretty good, if maybe a bit innocuous. The malbec is okay--lots of blackberry, pepper, and vanillin. What turned me off about it was the somewhat creamy mouthfeel. I don't know, just not totally nuts about it. It was okay.
As far as Malbec goes, I much prefer the Kirkland Signature (Costco's private label) Malbec to the Graffigna. This is a smoking deal at $8. Malbec must be a hot category, because Costco certainly has several from either Argentina or Chile. I don't think it's that surprising given wines like this one. At $8, you're going to be hard-pressed to find something from somewhere else that delivers as much bang for the buck. Deep, dark blueberry and blackberry flavors that are rich and balanced, this is a great buy for $8.