It really depends on your individual dining style and preferences. Like the previous poster, we absolutely prefer TIW. But you might want to consider the following:
1) Do you have pre-teen or teen "Disney adults?" We have three children, but two are pre-teen "Disney adults." The dining plans costs far more than the cost of the food they would actually order and eat. One is relatively adventurous, but orders appetizers and soup, while the other orders exclusively from the kids' menu.
2) Do you always order entrees? I order appetizers instead of entrees almost everywhere. So the dining plan wouldn't work for me.
3) How many ADRs do you have per day? How many are signatures? We have two ADRs per day - that's kind of in between the DP and the DxDP. And although we book lots of signatures, neither our two pre-teens nor I order full entrees, so the math doesn't work there, either.
4) Do you order dessert? We rarely eat dessert with TS meals, so the dessert on the dining plan is wasted.
5) Do you order wine/beer? TIW discounts wine and beer, but the dining plan does not include it.
So I'd suggest that you roughly map out the ADRs you would make, look at the menus on allears, decide what you're likely to order, and compare the price of DP and TIW. Good luck with your decision!