I have both (Brifters on my CF and down tube indexed on my old Steel Fuji Ace. At times I have to think twice to remember which I am currently using, but once in the right mode for the right bike, it is a automatic.
That said. I do find the brifters. much more intuitive to operate with no change of hand prosition required. If money is no object, go with Brifters. If you can appreciate the $50 savings, down tube shifers are more than adequate.