I'd keep them. The value of these are a little higher since both have no-hitters to their name. I'd say the Verlander one is worth more since has a nice little MVP feather in cap.
Don't sell off if the value seems to low. A lot of these cards may have been worth something one day but the value increases and decreases over time. Best advice I can give you is to check frequently.
Man I love the way these cards look. They have an early 90's grunge type feel to them. Old school cards are the best. Glad they are bringing back that look a little bit.