If the FSX had all the options that the FS1 has right now, it would be almost perfect to me. Graphically, the FSX is superior and will eventually get more options, so I think it will be a polished product in the future. TGC I cannot speak for, but I hear rave reviews about it and graphically, it looks the best of all the ones I have scene.
In addition to Yongchai's suggestions, my wish list would be:
Options for the brightness/contrast
Being able to use the minimap to place yourself on a course and practice shots from there.
Some more camera options for ball flight that are similar to the FS1
Have the auto putt feature that is present in the FS1
SOUND!
I think will all updates coming, they will get there.