I have both the C-Tug and the Hobie Scupper Cart with the gray Wheeleez tires. I like the ability to load the PA14 on the C-Tug without tipping the boat on its side, but you are correct that the shape of the PA hull doesn't really work with the C-Tug. It is much better for a flat bottom boat. I would go with the scupper cart, but take a look at the Hobie heavy duty cart with the hard tires to determine if that will be better for your primary use. If you are in sand a lot, you might be better off with the gray Wheeleez tires, but if you are on hard surface most often, the hard tires on the heavy duty cart will likely serve you better. I've been using the scupper cart with my 2010 PA14 (without reinforced scuppers) for over two years without issue. If you are careful and always make sure to fully insert the cart and use the locking pin, you won't have an issue, especially with the new reinforced models.
Of course, there are loads of other options. Check out this cart I just spotted at REI -- http://www.rei.com/product/815324/seattle-sports-atc-boat-cart