Before I start I want to make the point that there are LOADS of ways of mixing two synths together that may hit similar frequency areas. This is simply using the examples you gave me and saying how they mixed their arp.
The three main things I would bring up are firstly your arp is a lot wetter than the other examples you gave. The supersaw is also very wet, meaning they both sit back a little to the same degree. Maybe consider drying your arp so that it hits harder to the listener. Secondly, you can consider panning. Now, I wouldn't say hard panning, but just push it slightly to the left or right. Alternatively, duplicate the arp so that you have two of the same, and hard pan one to the left and one to the right, see how that sounds. Thirdly, and potentially your best choice, would be to make your arp more 'pluck-y'. This seems to be an effect used by both examples you gave. All it entails is using the mod env on the oscillator(s) pitch, then adding a slight decay (by slight I mean <150ms). Experiment with this, and you'll find you get a nice sharp attack to the synth that can make it cut through the mix nicely. One thing to be wary of with this is if you have heavy compression on the synth, as that can destructively alter the effect. Try experimenting with no compression on your effects chain if you have some, as it will give you a more accurate idea of whether the effect is working.
Hope this helps
