Hi there,
I have all 3 of these modules.
The F16 is making great strides since its release, but for me personally, I don't use it much due to the nature of so many things changing in each release version as it matures. It will be a great module but I just find it a bit frustrating right now.
As you say, FBW so not much to it. Point it where you want to go......but boy, does she go. :)
2) AV8B - Love this aircraft and since release its been worked on a LOT to remove many bugs and add many features. Its been a slow process and we are still not there although its perfectly flyable for the most part. In all honesty, as much as I like it I just dont have enough time to go around as Im usually in the Hornet or the Warthog.
Which brings us to the A10C....
Still my favorite. Super mature module, everything pretty much works as its supposed to, you will need to 'fly' it and use your trim hat switch a lot and the new updated cockpit is super nice.
Lots of missions and campaigns available as well which really makes a huge difference. So much content you wont be bored for a very long time.
Better still, wait for a sale again and buy two or all three!