X-Plane is going to require that you understand how to configure flight controls and such. It requires more experience and knowledge of computer operations.
FSX is 'simplier' in that it is ready to go after the install.
To fly well and understand what is happening is going to require that you be willing to put in time practicing, reading, doing tutorials and be willing to follow directions.
Flying, even in a sim, does require that your learn about the process. One of the strong points in my opinion is that it makes us learn.
If you just want to fly without the background work - I suggest MS Flight - the new free product. It has no airliners, but you can learn enough basics that you can go into X-Plane or FSX and learn more quickly. I really wish FSX and X-Plane would require a certain number of GA hours and a certain skill level before allowing people to fly jets.
Folks who jump straight into jets almost always have a lot of trouble.
@ PawPaw's house - near KADS, Addison, Texas, USA