Decision 42 smells more refined and lasts longer throughout the day; you get this beautiful whiff of creamy wood with a Middle Eastern take you come to expect from the house. Bonus: on skin, you get a lovely reminder of what you are wearing the more active you get.
Final Verdict: 42 gets you 90% of the OG, lasts a bit longer on clothes, and isn't as refined. It hasn't aged, but as I let it sit and test it, I will update this post. I liked the Dua version a bit more for clothes, as it was fresher, less woody, and more airy.
If the budget allows, I would go for the real thing, but if you'd rather keep some change in your pocket, I would suggest trying Dua’s inspiration.