Elemental Fist and Stunning Fist

Hey folks, just a question about the Elemental Fist Feat.

I am a level 9 Unchained Monk. I have the 'Dragon Style' and 'Dragon Ferocity' Feat. The latter feat mentions this:

Special: Taking this feat allows you to qualify for the Elemental Fist feat even if you do not meet that feat’s prerequisites. If you do not meet that feat’s prerequisites, you must choose one of the damage types that feat offers, and you can use only that damage type with your Elemental Fist attacks until you meet the feat’s normal prerequisites. A monk with this feat can use Elemental Fist as if he were a monk of the four winds."

The paragraph of the Monk of the Four Winds says this:

At 1st level, a monk of the four winds gains Elemental Fist as a bonus feat, even if he does not meet the prerequisites. At 5th level, and every five levels thereafter, the monk increases the damage of his Elemental Fist by 1d6 (2d6 at 5th level, 3d6 at 10th level, and so on).

This ability replaces stunning fist.

So if I were to take Elemental Fist as a FEAT (which I qualify for because of Dragon Ferocity), do I lose my Stunning Fist? Or do I get an additional ability?

As a 9th level unchained monk you most likely qualify for elemental fist regardless of Dragon Ferocity, unless you somehow managed to get that far with 12 Con (if u did, tell me how you managed to survive cause I might need it)

That said, you don't lose stunning fist by taking elemental fist. You just deal extra damage with your attack 2d6 at your level, and 3d6 at 10th.

I'm wondering if it's really worth it...

Correct. You do not lose stunning fist.. The format of the archtype abilities always end with what they replace for the archtype. You can ignore it in this case :)

I have an unchained monk with the same setup. I like it.

My con is 10. I'm going for a bit of a high risk, high reward built, haha. Thank you very much for the answers!