I have brewed both of these kits. Just bottled the Holiday ale a couple days ago. It was tasting great. IMO this needs time to mellow out. When it's young all the spices are right up front and a little harsh. Give it some time and it'll be great.
The Double Chocolate is good, but I think this one needs even more time than the Christmas Ale. The doube chocolate was my second batch and it still hasn't hit it's sweet spot. If you read the reviews on AHS site many people will say the same thing.
So, BK said;
First Brew - Holiday Ale
Not First Brew - Double Chocolate Stout
Out of the two I would say the Holiday would be drinkable the quickest. So if you're doing it for the Holidays (which I would think you are) then get that burner started!