OK, here comes the typical duckbilled long answer to a simple question:
In FS9 I had a ton of freeware - just about every airport I could get my hands on. In FSX, things are very different. I have very little freeware scenery on my HD. The fact is there really isn't much out there that I am interested - not many major airports or commercial airliners at least. In addition, I mainly fly to and from airports that have AES support. FSX freeware airport scenery with AES support is even more rare.
I'll pay for quality but I expect support. I expect products to be tested with and updated for for the most current version of FSX (not just SP2, I mean Acceleration) and the most current software (Win 7). Obviously, I don't expect every FS9 title to be updated to FSX but I do expect every FSX title to be updated to Acceleration. Many developers will say products are SP2 compatible but they don't mention Acceleration which can present different issues than SP2.
To me, it seems like FSX is killing freeware. I don't know if it is more difficult to work with, there is a lack of interest among developers or their is a perception among developers that no one uses FSX. I'm not sure if the various versions of FSX have made it difficult for people to work with. Either way, there is a lot less freeware to choose from in FSX than there was with FS9 in 2007.
One big change for me with FSX was the camera system. Without the ability for have 2d cockpit views in FSX it made the 2d cockpit useless for me. After all, how can you fly only looking straight ahead? As a result, I exclusively fly in the vc in FSX. The point is, every aircraft needs to have a good quality vc in FSX for me to enjoy it and since they are difficult to produce, there are few suitable freeware aircraft out there for vc flyers. MS did one that that was nice in FSX - the programmed the ability to trade out vc's between aircraft that are compiled with the FSX SDK. If anybody (freeware or payware) was to advantage of this, we could have a whole new genre of add ons - add on vc's only rather than add on panels. This would be a huge step for FSX.
To answer the original question, I like the approach groups like ORBX have some payware, some freeware and a lot of quality. Of course, I want things for free but I would rather pay to have quality and support.