DTS has a better sound quality than Dolby Digital.
DTS uses more bandwidth than DD.
Just WOW on your first part of the answer. Can you source some information on this, or is it a personal opinion?
As to your second part, can you explain how this matters?
My take, they are 2 propriety audio solutions that provide different means to a problem. No one is better than the other.
As far as the fact that a DTS stream uses more bandwidth really makes more difference in home entertainment when the total size of a bitstream is limited by the medium, i.e. cable television, DVD etc.. As far as PC gaming, it really makes a huge difference because the visual effects of a game use so much bandwidth that the developers often leave very little bandwidth for the audio. I guess that it is just a matter of priority; since every file or medium is limited to a total of "X" bandwidth, where do you allocate the bandwidth, audio or video? Thankfully with newer Blu Ray technology that question is pretty much moot, but there are still limits.