I'm not certain, but I believe they are all the same item out of China branded to each individual company just as many of the rooftop tents are. That said, I've been pretty happy with my ARB awning with mosquito net.
Not necessarily true. While many 'put your name here' versions of tents and awnings are out on the market, you won't find that with ARB. Take their Simpson II tent, a year plus after they discontinue and move to their updated and improved Simpson III tent, Ironman releases their tent which is in fact very similar to the now discontinued model. Not to say there isn't a market for both but there is a reason ARB moved from them

ARB is now on their Simpson IIID model tent which again raises the bar from the SIII, IIIB, IIIC models. Likewise with many other brands of tents, while they look similar from 10', close inspection reveals different tent material, bow construction, hinge thickness, floor structure, ladder, etc. Now there are obviously many that are the same... but ARB is not one of them.
As for awnings themselves, I've not seen any of Ironman's latest offerings, they may be very similar, I can't comment there. ARB's latest version has been working out great, spares are available through their US dealer network and the material and cover are right there in quality with their latest RTT offerings.