We've been to both and we loved the character interaction at garden grove (weekend breakfast) The characters sat in the chair for quite a while interacting.
We liked the food at the Coral a little more. There was a wider choice choice at the Coral as well. There were plenty of baked goods which were pretty good. A whole japanese breakfast section for the adventurous (I didn't venture)
They both had place where the chef made eggs any style you wanted, both also had fresh fruit, cereals, baked goods. bagels, pancakes, waffles, yogurt.
Which ever you choose, don't forget your Disney Club card for a discount.