I use x-plane. Ted is big into it at the moment, Murray, Andrei and Eric-Jan all own it as well.
To answer, I really need to know how you like to fly and how much you spend on payware - what computer specs you have etc.
You get 4 DVDs worth of world scenery with x-plane, the ground looks better than MSFS, but most airports have no terminal buildings until you download a freeware or payware scenery and install it - this will be addressed in x-plane 10 out this year which adds facades and plausible terminals to airports.
X-Plane is a superb sim, but it is different to MSFS and you will need to learn how to use it, as you did microsoft flight sim - they both have theirn strengths and weaknesses. The add-on market is developing, so not as strong as for MSFS.
Currently X-plane is strongest with smaller aircraft - props etc - there are a few study sim jets in development and there are some excellent payware and freeware out there.
X-plane payware is generally cheaper than MSFS payware
X-plane generally runs better (perfromance) than MSFS
X-Plane's flight model feels superior in smaller aircraft (in my opinion).
MSFS has more study sim aircraft and a more established / larger community
X-Plane is growing and many add on makers are starting to make add ons for x-plane
MSFS (FSX) Looks better than x-plane generally, although x-plane can look better (x-planes lighting system, efficieny are superior to MSFS allowing for much better looking aircraft/scenery to run, and the number of good stuff is currently small but growing).
have a read about, check out screenshots and videos on youtube and grab the demo to try for yourself.
http://www.x-plane.com/pg_downloads.htmlYou get 10 minutes until it ignores control inputs, then restart the sim to get another 10 minutes etc.
