FSX...
On the plus side...
The entire world scenery.
Lots of default aircraft which are not bad,except for the A321,that one is a disaster.
Automated ATC...not the best but it's there.
FPS is pretty stable....
And that's about it.
Minus side....
If you want some really good aircraft,you have to turn the entire internet upside-down. FSX is an old sim so,most add-ons are old. Not to mention paywares....really expensive and sometimes really bad.
Live weather system is another disaster,you need to look for Live Weather add-ons which can be expensive.
Basic scenery can be terrible,soooo,you will have to look for scenery add-ons ...again,can be difficult.
Some planes are far better in FG...
Almost all Airbus planes.
Boeing 757,767,777 and a 787.
Some fighter jets and so on....
And I'm talking about freeware planes.
FSX is a payware so,you have to buy it... FGFS is free.
Regards
A winner is a dreamer who never gives up...