I have an 08 450 with Eric at Innovative tunes. His tow tune is great, love it. Tow 18000+.
I am amazed that H&S and Spartan are really the only one pushed on the forums.
Eric tuned my 6.0 also, love his tuning. I am not into racing, more so about reliability and towing. I cant tow with to much more power up the grades I tow, truck would get too hot.
For power the tow tune is great I gained almost 10 mph up one of the steepest grades I tow. If you want to look it is 166 between I-5 and 101. I used to drop down to about 43 or so stock, truck backed down, I think from EGT's blurping 1400. Now I have to try to get to 1250. Less throttle and fuel used. I am sure the others are good, but I would research and choose for yourself. My exhaust came from Nate (DSTRBD) above. Great guy.
Edit to add link.
Here is teh link I made when I first towed up the grades with Eric's tune.
Innovative Diesel SCT Tuning