I fly the DX8. I personally love the radio inside and out. However, I believe both radios are a very good choice. For me personally, I find the DX8 menus and interface much more intuitive and easy to read. It just makes sense. However PLENTY of other people do fly Futaba and love theirs as much. Sadly, it comes down to preference. Both are really good.
If at all possible, try to get with some people at a fun fly or local field and see A.) What they are flying and/or B.) Just check out both types of radio. In particular, it is much easier to have several guys flying the radio you choose for direct support although the internet helps a lot. If you cannot find both radios in person, just do as much research online.
Sadly you will see a lot of debate between the two radios but I don't care what people say. There are potential issues with both units. Again, in short, both radios are a good choice and you should try to play with each to see which one you prefer.