Any TSBs on a 13 year old truck would most likely be fixed by now and an 06 Ford chassis and everything else is as relaible as you can get, all things considered, Except for the engine. Since you don't know much about trucks, if you don't know much about trucks don't get a Ford 6.0 diesel. Any of them.
Ram will be a good choice, in general. Won't pull quite like your old Excursion, but as with any vehicle with that high of miles, the condtion of the truck is just as important as the brand.
All bets are off if it will have minor or major issues at 200k unless you have good assurance of the vehicle history.
Of those 2, I'd get the Ford because I'd want the power of a diesel, but at the expense of k owing the issues and it would have to be more of a deal tha other trucks and I'd plan on bulletproofing it.
For plug n play I'd get the newer ram. 7 years newer is more peace of mind that you won't have as many old vehicle problems as soon, but same due diligence is required with such high miles.