I think it really depends on what kind of flying you want to do and how likely you are to purchase 3rd party addons to tailor your FS experience.
I bought the Premium Deluxe package at release, mainly because I wanted as many planes as I could get my hands on. I figured it would be awhile before quality 3rd party payware would become available.
Almost a year later I can say that I rarely touch the default aircraft anymore, and I rarely hit the big international airports because I prefer flying small GA, bush flying, etc etc. but they are there if I ever get the inclination. You never know where a Mudspike Trek might take us.
I have found MSFS to be a truly excellent experience, and I was very skeptical in the lead up to release. 12 months later and it is pretty much the only sim I fly these days. A truly excellent VR experience and in 2D the screenshots speak for themselves.
Edit…. I should add that the flight modeling in MSFS has some quirks. Purists will tell you that X-Plane is superior, and in this department I would agree, but I have come to the conclusion that there is more to a great flight sim experience than the flight model alone.
Have you bought it yet?