Well seeing as how you're jumping from truck to truck on a rather frequent basis, I wonder whether or not you've had the opportunity to analyze and compare each truck's reliability from a longterm perspective. The F-150 is very much catered to those who buy a new truck every few years because they bore easily.
10-speed I'm sure is well-built, though I'm not sure 4 extra gears really adds all that much value.
The Tundra's brakes, as far as I can tell, are bigger than what the current F-150 has, so I don't know why you think the F-150's are "better."
Aluminum can still corrode, and the aluminum body was more about weight savings than anything else.
The 5.7l does have aftermarket support, to include super-charging options, but honestly those modifications have little relevance for the average owner and certainly not for the person intending to own and use this vehicle as a longterm overland rig.
F-150 has a higher tow rating than does the Tundra, but oddly enough the Tundra has bigger brakes, a bigger rear differential and a bigger tow hitch. I honesty don't care too much for the best-in-class 1/2 ton tow ratings...they seem more derived from marketing hype than anything else. 10k lbs is reasonable limit, beyond which you're better off going with a 3/4 ton.
