I'm quite sure that DTS is a higher resolution format, not sure on the particular details but almost any movie that you rent that has it will sound better in DTS in my experience. Thought that I read somewhere that DVD-A is 24/48 and DTS is 24/96 but I could easily be wrong about that. Regardless, best to have a listen to both and see what you think as quite often the differences are very subtle and will differ from system to system.