Looking at the Power and weights, the LC is in front as it has more Torque and KW plus 300 kgs lighter.
However, for long haul touring point of view, it is easy to see that the F250 (such as this 1 in the add) with the tray replaced with a lockable canopy will be a lot more comfortable for creatures inside and storage of kit in the back. Also, the 1090 kg load capacity is a bit of a bonus over the LC which could balance the lessor power.
My parents have owned one of these from new and it has been very reliable so far. It let them down once due a fuel hose leaking air and causing the fuel system to lose prime which made starting very difficult.
Theirs has LPG fitted which adds 26HP and a whack of torque so it is a little different in terms of power. If you turn it off you notice quite a difference, but overall my understanding is his truck with a 2000kg van and other gear on board will typically run rings around a similarly loaded LC on hills.
More power/torque on paper doesn't always translate into better performance.
Has anyone used 1 of these with the 6 cyl in anger dragging a CT over a dune etc, how did it go?
Did the near 4 tonne GVM kill it in the sand, or do very B I G boots sort that out?
We had it out in the desert last year and it went really well, however the extra width and length can be a hindrance on its own in some of the tighter areas. I towed a trailer behind my Jeep and found the going difficult at times depending on the condition of the track, basically it was bloody rough in places.
Anyway towing a trailer behind an F-Truck particularly if it has a narrower track will be more difficult. If it was the same width this would make life much easier, if not you'll be in a world of trouble in some places. Dad has towed a my BiL's Tambo on Fraser and found it was difficult in places due to the trailers narrower track.
Why the chat, well, keep this quiet, but I'm feeling the pain of Troopy Travels and lack of comfort these days, something to do with getting old and broken me thinks... 
Just be quiet around the Troopy, don't want it to know.
This is a very comfortable touring truck, good power, economy and space, even the bench seat is pretty comfortable. The other good thing is corrugations seem to just disappear, one of dads mates nicknamed the F-truck the ironing board because of this.