A-10 is probably the most complex of the available modules. I mean insanely complex, just watch some uTube training videos on what you have to do just to set up an attack, of navigate, or whatever - it's amazing though, and rewarding fun once you put the time in.
Flaming Cliffs 3 while advanced, is nowhere NEAR as complex as the A10 sim, and can be jumped into fairly quickly once you figure out how to set up your HOTAS (PITA and has to be replicated for each aircraft), as well as how some of the radar modes and weapons modes work. There are some fantastic videos if you do a search for FC3 DCS on uTube, some great 4 v many with the F15 videos, as well as the same with all the Sukoi and Mig models.
I would recommend getting the free Su25 and trying it out, then FC3 next, unless you have a LOT of time on your hands and want to jump into the A10 DCS module.
