I do have considerable experience with SFT.HD Diesel in Canada would be my recommendation. I don't have experience with SFT.
Not sure where you got 200 miles. I track my regens. With SFT tunes locally I'm getting about the same or slightly better intervals as a stock tune. My GDE tune was about the same for local driving. On highway traveling it's a different story, 100% Freeway & hiway I get between 767 mi & 1003 mi which is about the same as I did with the GDE tune. Caution - This data is pre-AEM SFT tunes. I have no data since my recent AEM flash and SFT's corresponding tune.The high regen cycle is a killer in my opinion. Every 200 miles?!? That's absurd. I wouldn't go with a current GDE tune or SFT. The original GDE tune stretched out the intervals and was great. HD Diesel does this as well.
You still have your Eco. If so what all have you done to it. Mine is showing the PO299 Low turbo boost long wit Po402 EGR Flow Excessive.No way you'll get an accurate number to that longevity question.
You're right, the unmolested used diesel has a higher resale value for sure. I justified the delete for myself as preventative maintenance for the second 100k miles, if not more. But if you plan to only have the truck a short time, an emission intact tune would be your best bet.
X2 to what John said in all respectsI
I do have considerable experience with SFT.
SFT has great tunes, is customer satisfaction oriented and the lowest prices (goes on sale often) and is in the great USA.
I have used the GDE tune (same as HD Diesel's ??) and find the SFT tune to be as good if not better at mpg, towing and low-end torque. The negative, to some, is their regen cycle is more frequent than GDE's. However, I've read that GDE's longer intervals come at the cost of higher temps, maybe too high. The SFT transmission tune is likewise excellent. SFT has a lot of very satisfied customers.
I'm not badmouthing HD Diesel's or GDE's tunes as they are great tunes. I'm just offering my experiences and knowledge with SFT.