I had nothing but problems with my 08 powerchoke. The day I traded it, it cleaned the exhaust filter 7 times in 400 miles! Ford said nothing was wrong with the truck. I traded for a Dodge that now has 2500 miles on it and have not noticed it cleaning the exhaust filter once! I paid 68K for the Ford and the best I could get on trade ( which was still in showroom condition) was 40K. The same dealer that sold me the ford truck only offered me 35K! So that kind of told me what they thought of their product.

No brainer.....the Dodge is the more reliable of the two, unless, it has been ragged out.

I have an 06 Ford and love it, but the 08 has a different engine and like mine, either you get a good one or bad one. Ford has a report that can be retained at any Ford dealership called the Oasis Report. You need the vin, but its worth calling them up and finding out what work has been done to the truck. The Ford has a higher GVWR, more torque, and a much better transmission than the Dodge. I like the interior much better on the Fords. It's quieter inside and out, but Fords are a little more expensive to maintain and really require "motorcraft only" upkeep.

HOWEVER  

The 06 Dodge probably has the 5.9l cummins (I am assuming its diesel) and that is the good diesel (no EPA crap-it's before the DPF came into effect aka exhaust cleaning). If it is an early 6.7 cummins, beware. The transmissions that are mated to the 5.9l in these trucks are known to go bad. You may end up running into issues with the short bed on the mega cab if you pull a gooseneck/fifth wheel. Ball joints on these go quick as well. My uncle has an 07 dodge diesel and just replaced the ball joints at 50k miles. On the bright side, they're nice trucks, have nice interiors, have plenty of power, and are much cheaper to maintain.

This is one of those "pick your poison" situations, IMO. It was for me when I chose my truck. I have been very lucky with it (dreaded 6.0 powerstroke). No matter if its Ford, Chevy, or Dodge, they all have their own issues. It really comes down to which one you like more than the next and whats in the budget! 

Good luck!

Here's my opinion.......  I would buy the Dodge NOT running before I would even look at the Ford.

The 06 Dodge is going to have the 5.9L diesel, but will only have the 4 speed automatic (unless it has the hand grinder)  Your fuel mileage is going to be much better in the Dodge and less trips to the service department.

Well, I guess I'm the lone Ford guy.

I have a 2008 F350 Supercab Dually and I love it. There is rarely a week goes by that I'm not pulling some kind of trailer somewhere and this truck just loves to work. The harder I use it the better it runs. Bought it new and have just under 41,000 miles on it. It has the 4.10 rear end and I consistently get 13.5-14mpg during everyday driving. That doesn't sound like much but it's better than my old Dodge dually with a V10 engine. Used to only get 10mpg with it.

If you are looking to get the Ford have them run the Oasis report and find out if they have replaced the radiator yet. The 2008's had a problem with the a batch of radiators that leaked. Most should have had them replaced by now.

Mine only regens about every other tank of diesel. Usually lasts about 10-15 minutes and then it's done. Doesn't affect the power at all while regening.

Last fall I hit a 250 lb buck head on and the truck never stopped running, I just turned around and drove it back home. It's one tough truck!

I never worry about my wife going away to a show by herself when she's towing with the Ford. Never once has it had a problem.

Just my 2 cents.

Nothing like keeping the back side coooooooool!