Get the one that feels best in your hand. If you have the opportunity to hold them do and then decide. They all have 3 million adjustments you don't really need and are both great.
The DX3R s really light and has a very easy menu although some people think it feels a bit cheap.
The Futaba is no doubt also brilliant and will control your car just as well.
If it's comfy it's right for you. Try not to buy something without having held it first. And it won't actually improve your laptimes the more expensive it is
