As far as has been seen, Dragon Slayer.
When the dragons slayers beat Faust, he actually thinks that he sees dragons in front of him. (Mental warefare)
Natsu can wreck anything. Without trying. Rogue even calls him a disaster zone, comparing him to a system of natural disasters, and that they have to wait it out until he calms down. (Frosch Story)
Sting has White Drive, Rogue has Shadow Drive. Not quite Dragon Force, but a precursor stage.
Dragon Force.
Can combine other dragon slayer powers, making themselves more powerful.
Bathing in the blood of dragons turns a dragon slayer into a dragon.
Natsu beats a god-slayer. Wendy ties with a god-slayer who, judging by her physique, is at least a year or two older than her. (Could be wrong though)
Laxus can tank one of the ten wizard saints. The same one who tanks a god-slayer.
Other than this, I'm sure that the list could go on and on, but as we have seen devil-slayer magic do nothing more than freeze a calm and friendly (at least, by that point in time he was calm and friendly) flame dragon. And that even the details of that battle are...sketchy, there is no appreciable way to compare it to dragon slayer magic as the two have not yet gone head to head. However, in the next few chapters, we may be able to compare the two. But then again, maybe Natsu will just destroy everything, as per his usual.
So my verdict. Dragon Slayer magic.
When the dragons slayers beat Faust, he actually thinks that he sees dragons in front of him. (Mental warefare)
Natsu can wreck anything. Without trying. Rogue even calls him a disaster zone, comparing him to a system of natural disasters, and that they have to wait it out until he calms down. (Frosch Story)
Sting has White Drive, Rogue has Shadow Drive. Not quite Dragon Force, but a precursor stage.
Dragon Force.
Can combine other dragon slayer powers, making themselves more powerful.
Bathing in the blood of dragons turns a dragon slayer into a dragon.
Natsu beats a god-slayer. Wendy ties with a god-slayer who, judging by her physique, is at least a year or two older than her. (Could be wrong though)
Laxus can tank one of the ten wizard saints. The same one who tanks a god-slayer.
Other than this, I'm sure that the list could go on and on, but as we have seen devil-slayer magic do nothing more than freeze a calm and friendly (at least, by that point in time he was calm and friendly) flame dragon. And that even the details of that battle are...sketchy, there is no appreciable way to compare it to dragon slayer magic as the two have not yet gone head to head. However, in the next few chapters, we may be able to compare the two. But then again, maybe Natsu will just destroy everything, as per his usual.
So my verdict. Dragon Slayer magic.