I've got a 60 right now but had a fjc for quite some time.. pretty built up.
I think it all depends on what you want to do with it and you.. are you patient? do you enjoy the ownership of a "vintage" truck? can you do some repairs on your own, or do you have a bankroll to have someone baseline the 60? is ride quality/ noise/ comfort important to you?
the fjc, is much more comfortable, faster, safer, more fuel efficient, modern, and I want to say even more capable off road , stock vs stock then the 60. Also it's reliable already, no need to go in and baseline everything.. I miss the fact that I can just hop in and Go, without any worries.
yet.. I chose the 60, why? It's got character and it fit's ME better.I just love the truck... Other then the 60 being larger, the fjc makes much more sense for me... but love doesn't always make sense. and I love the 60 series... and just simply enjoy it more.
You see FJc's all over the place, but the 60 is unique. It's slow as a turd with the 2F, and has it's quirks and issues, but i've learned to just cruise in the slow lane and enjoy it. One thing that's a definite difference, as lcwizard mentioned is that the fjc chassis seems to be a lot more "light truck" then the 60. Just go under and compare the metal thickness on the frame alone.. I had the issue of my fenders bulging on my fjc and had to have the dealer fix it.
the FJC, kicks the cruisers butt in high speed / washboard/ dirt roads etc.. with it's IFS. If you stick with 33's, you also don't need to regear, and with the stock locker out back and atrac up front, I think it might also be cheaper to mod then the 60, depending on what you want to do.. I also think the fjc is much more comfortable on long trips, then the 60.