The only cubes where this is the case is their 4x4 and 5x5, and I think we all can agree that you get exactly what you pay for with the Aosu. And as for the Aochuang, I've done hundreds on solves on it, and it is absolutely amazing. It's way better than my modded SS that had even more solves on it.
And as for their 6x6 and 7x7, I don't have the Aofu, so I can't really say much about it, but I do have a mini shengshou which is really nice. And to compare the SS 6x6 to the Aoshi, the turning on the Aoshi is really nice, which is mostly attributed to the plastic and build quality of the pieces, which is where your price comes from. With the SS, it just feels cheap. Honestly I haven't done a ton of solves on either the SS or Aoshi, but I can tell you the the Aoshi is absolutely terrible out of the box. With some lube and tensioning and a few solves, it gets better, but it still feels rather unstable and bumpy. But how does it compare to the SS? Well, it never pops, ever, you don't get those extremely annoying catches (although you do get lockups, but they're easy to fix) and as I said, the turning itself is really nice. Unlike the SS, you don't get lockups if you turn accurately. With the SS, simply doing slice moves causes catches.
And as for the comparison, Moyu wouldn't be like Beats. you can get sound quality from 50 dollar headphones that you can get from beats. With moyu, you're paying for top of the line quality, albeit with a heftier price tag. If we were comparing to video cameras, Canon would be shengshou, and RED would be moyu. Except maybe not 30x more expensive, but the quality comparison is there.
Also, no offense, but it seems like all you are going off of here is just conjecture on the quality of moyu cubes. I know that you're not all that fast, and that's fine, but do you even have both moyu and SS's 5x5, 6x6, and 7x7?