Best variety of garlic for slow cooking?
Almost all readily available garlic is of the softneck variety. The mildest of true softnecks is artichoke garlic. Aside from a true softneck garlic, you may also want to try Elephant garlic. This is milder than true garlic, as it is actually part of the leek family, and might be too mild for what you're attempting to do here. Try both!