I have all three. Each has a place. I use the cadet the most, but mainly due to the size and pocket friendly nature. I work in an office though so YMMV. I rarely use the saw on the farmer so that gets the least amount of time due to the size/weight. I will take it camping, but it rarely gets used any more. The Pioneer is quite handy too. Slightly thinner in a good way, and it has the tools I use most on a daily basis. I carry it on the weekend or after work at times in lieu of the cadet. It just has a rock solid feel about it. If I had to pick 3 to live with for the rest of my life, it would be in there.
I saw a pic in this forum of someone that made an awl out of the file on the cadet. To me that has the most useful tools in a small package. I guess it depend on your needs/wants. One general comment is that the lanyard ring digs into my hands and has been filed off on all three for comfort reasons.