They are indeed attempts to clone Creed Aventus, and for the price they are not too bad. The real thing though is so much more complex, which is to be expected really.
imho: Fine's platinum is the best Aventus
type on the market, it uses Aroma compounds to approximate the Creed while Stirling's offering uses a combination of two fragrance oils. In practical effect (to my nose having smelled both over several months) there is more nuance to Fine's Platnium while the Stirling has more brute power (sillage), but less complexity. Before anyone explodes, I think both are very well done but if I had to choose I would go with Fine's Platinum and other people may have the exact opposite opinion
Also, I have a Limited Edition AP Reserve fragrance coming out in late January 2018 called 'Coolabah' that you may just like a great deal indeed if you like Creed's Aventus...