The chip they have is a TS chip that has generic tunes made for any truck that comes along. If you buy from a vendor that burns their own tunes or has "custom tunes" the tuning will be specifically for your truck. They take in consideration aftermarket trans, air intake, exhaust, injectors, ect... You will get more out of custom tunes than you will a chip off the shelf. To answer your question on the TS vs TW - TW stands for Tony Wildman who is owner of Total Diesel Performance.
Call Bill @ PHP or search through the vendor section here on the forum and see who offers custom tuning, give them a call, and tell them what you are looking for.