ripnet
Pre-Flight
X-Plane is, without a doubt, the better simulator. FSX is for children.
Having used both for several years, I have to agree. FSX was very good, but I think X-Plane is better. I also like the ability to use UDP to read/modify sim data. I have a microcontroller communicating with X-Plane for an MCP I made (has knobs for radios, heading, course, altitude, etc).