It has a more depth as well and is simpler to learn and use. The DFX is a great detector and was once my favorite, but the F75 has a little more up to date technology, a little faster, and works better in iron. Both have excellent TID numbers, but the F75 separates them a little better, and has a all metal mode that can also ID. I will say these are advantages, but not overwhelming. However, you will like them once you have them.
Compared to a Explorer I usually tell someone asking that the F75 is a good compliment to it. I can't really say that about the DFX, but you would benefit if you could have both although the F75 will cover pretty much everything on a DFX. For instance the F75 has a marked speed advantage over an Explorer, but the DFX is pretty fast too. So that is one way they do not compliment each other.
For now, the DFX does have far more coils to work with. Also Whites will soon be releasing a new detector that will almost surely replace the DFX as their top end detector.
That is my dilema. I've bought 5 detectors that replaced 4 of my previous ones. Now if Whites has a new killer detector, I've pretty much spent all I can spend.
But the F75 will be a better choice for you right now if you have to buy today, in my slightly guarded opinion.
HH Alton