All depends on what you are looking for in a call. I have the FX3, one of my hunting buddies has the Fury and another the new Prarie Blaster. Have used all three and like them.
With the Fury you can save more sounds and you get a better remote. I think the excess storage space is a wash. The FX3 will hold 32 different sounds. I have mine loaded with predator and mountain lion sounds and don't routinely use more than 8-10 sounds. My buddy with the Fury only hunts coyotes and he uses 5-6 sounds. He is a serious hunter, goes every weekend and enters a lot of contests. He said if he had it to do over he would just get the FX3. Personal preference.
The nice thing about the FX3, you can send it back to the factory and they will put a bigger memory card in and switch out remotes for $200. You then have a Fury. So you can save the money at the start and if you find you want/need more you can upgrade to the Fury for the same money you would have spent initially. I have no complaints with the FX3. It is plenty loud and the remote works good. It doesn't list the sounds for you but they are on the back and after using it a few times you know what number the sounds are without looking.
I would add, whatever you decide, buy it from FoxPro or one of their platinum dealers. You can pick what sounds come loaded on the call that way. If you get a pre programmed model you will be spending extra $$ to reprogram it with the sounds you want. The FX3 would have come with a bunch of sounds I didn't want and would never use. Even if you buy new from a Cabelas, Bass Pro, etc. You have to pay for any new sounds that you want.