Chopsticks 
Rice pone
(I haven't seen the movie yet, but I've been spoiled it seems no thanks to an endless stream of memes).
On the surface, it appears that the Infinity Stones in the Gauntlet are excessively more powerful, at least in terms of scope at least. We're looking at a literal use of the power to snuff reality and reshape it. In terms of raw ability,+__the Infinity Stones are certainly far stronger.+
__
***However*_**, we're not asking which is stronger. We're basically asking if the two were combined in all their glory and faced each other, which would be superior for a final outcome?
For this, we can see what the Elements of Harmony have done, and how. They have turned raw Chaos power into stone. Overcame most, if not all, of the combined magical ability of weather manipulation, magic, and strength on a supernatural level (defeat of Tirek). Realize, the entire kingdom of Equestria is made up of literal superheroes with specialized, unique, and impossible powers. In each instance of it's use, it became a living embodiment to the antithesis willpower of malevolence and stripping it of all power in turn.
The Elements of Harmony have survived through time manipulation, memory and de-materialized erasing, reality manipulation, nightmares, shadow, even energy and magical absorption. All manner of incorporeal and concepts that are literally beyond comprehension.
_
*All 6 parts of each Infinity Stone houses power that has been defeated by the Elements of Harmony._
*
.
So while the Infinity Stones are likely significantly stronger, that's also irrelevant. The Elements of Harmony work on a principle of balance and restoration through raw willpower of love and energy given form. This isn't something that breaks or alters reality, it's something beyond that.
On the surface, it appears that the Infinity Stones in the Gauntlet are excessively more powerful, at least in terms of scope at least. We're looking at a literal use of the power to snuff reality and reshape it. In terms of raw ability,
***However*
For this, we can see what the Elements of Harmony have done, and how. They have turned raw Chaos power into stone. Overcame most, if not all, of the combined magical ability of weather manipulation, magic, and strength on a supernatural level (defeat of Tirek). Realize, the entire kingdom of Equestria is made up of literal superheroes with specialized, unique, and impossible powers. In each instance of it's use, it became a living embodiment to the antithesis willpower of malevolence and stripping it of all power in turn.
The Elements of Harmony have survived through time manipulation, memory and de-materialized erasing, reality manipulation, nightmares, shadow, even energy and magical absorption. All manner of incorporeal and concepts that are literally beyond comprehension.
_
*All 6 parts of each Infinity Stone houses power that has been defeated by the Elements of Harmony.
.
So while the Infinity Stones are likely significantly stronger, that's also irrelevant. The Elements of Harmony work on a principle of balance and restoration through raw willpower of love and energy given form. This isn't something that breaks or alters reality, it's something beyond that.