Get the TS. So versatile-retuneable when you get injectors, etc.
What is done to the truck?
I have a stock truck (I do have hi flo air filter and full turbo back exhaust) and put a TS Chip on it. All I can say is WOW! It is a different truck. I drive around town in the "70" and "100" mode, so much more responsive. As has been said, it isn't all that much of an upgrade by HP numbers(Max you'll see is prob 220 ish to the wheels w/ stock injectors) but with an older 7.3 it will make a noticeable difference. My 4x4 CCLB Auto trans, I've gotten 18.1 mpg on the freeway at 70mph, 3.55's and 285 tires in the "70" tune.
----Don't expect to beat anybody racing, unless you are towing----
I'd consider my truck peppy and spry (esp for the size of truck) but I get dumped on by any newer diesel, regardless of flavor when lined up. Even last sunday headed to church some kid in a mid 90's chevy was rippin' around so I gave him a go at the next light and I couldn't keep up. If we had 10k pound trailers on (or 22k# (most i've towed with mine... it was slow)) I could have wupped him.
Go for the TS, Lots of people can tune them. FWIW I rode in a literal twin of my truck last week, even the same color. The truck had an edge evolution, such a PITA. Took 5 minutes to change modes between econ vs race etc. Pain. I love being able to switch up or down while driving.
-Last thing, it is smokey with stock-ish truck and canned tunes. Even the 70 "hp" tune it will smoke like mad. In 100 and 140 I can literally black out the lanes behind me. Even freeway it will be trailing out black smoke in the 100 and 140 tunes. It is smokey. Getting bigger injectors and a custom tuned ts chip can be much less smokey but mo $. If you need to stay stock for awhile on the truck, do yourself a favor and get the chipped. People will say to get a custom tuned chip, but you're still so so limited with stock injectors don't worry about it till you get injectors. Best $300 i've spent for performance