Give Me Sun is a bit darker,more pigmented, silky, matte finish, slightly orangy. Good for medium skin tones (if you're fair use a light hand) It will cost you about $30 and you'll get 0.35oz
Sunny is slightly more orange toned, it's not so pigmented but build-able, somewhat gritty/chalky, matte, very natural. This is definitely great on fair to medium skin tones. $5 at my local Target, 0.33oz.
You're getting about as much product as the MAC bronzer for a fraction of the cost which is perfect if you're not looking to splurge.
I'm partial to Give Me Sun I will be honest with you lol however I use Sunny as an eyeshadow a lot and to contour my nose on occasion.