For me the great thing about Xplane is you can make it (it's sky ground and buildings) look absolutely stunning for zero cost. Just bandwidth.
You also get lots and lots of free planes and addons that are mainly very decent.
A really strong developer community, where you get new and interesting things released all the time (daily).
I really enjoy flying the Piper Arrow III PA28R-200 around Wales. Learning to master it etc is some kick., My home town (it's roads and buildings)actually looks like they should. All for free...(OK I on the Piper in a youtube competition off Wycliffe Barrett).
I am hoping to learn vatsim and learn to converse with Air traffic Control one day..but really ain't got the bottle at the moment tbh. lol
I love FSX too. Orbx Wales is Stunning.
And I love DCS.
for me it is not really a case of "each to their own"..it is just great that there are so many good flight sims out there.