So far, the arguments I have for tablet being better are price, which is variable, weight, and absolute positioning. I feel as though weight isn't that important, although I doubt i'm high enough rank and don't play DT enough to give a proper thought about weight and only really high ranked players could discuss it well. Absolute positioning is a definite advantage, but I feel as though play time will easily overcome these issues. Price is too much of a varying factor in my opinion and frankly if I were to purchase another tablet, I would make sure its a higher priced tablet with good reviews, etc. in order to make sure it is high quality. It seems to me that mouse is only marginally worse than tabler, unless you find using it uncomfortable to play with.
Earlier someone made a point how most high ranking players use tablet. However, this does not directly mean that tablet is better than mouse in a significant way. Consider this: People who have purchased a tablet obviously have a greater drive to play the game, as they were willing to spend money on it. Saying that just because something is more popular doesn't mean its better. That would be like saying because Coca Cola is the best soda in the U.S simply because it is the most popular.