This site is being deprecated.
Please see the official X‑Plane Support page for help.
The simulator will have all the same features no matter which one you buy. It's up to your preferences. If you already have Steam and are used to it, you might like to add X-Plane to that collection. IF you are interested in participating in beta testing, you can do that easier with the version from X-Plane.com. (Steam only receives the very last release candidates of beta testing.)
If you buy directly from the developers at X-Plane.com, then Steam does not receive any portion of your purchase and more of your money goes directly back into supporting X-Plane. ;-)
This site is no longer being actively maintained.