Yes and no; it depends on what you want, and what you mean by "good".
Meguiar's, EO, Mothers, and others all manufacture their products to work a certain way. Those products will consistently deliver predictable results to a very high standard. So, in the sense of good meaning "doing exactly what it is supposed to do", those products are every bit as good.
However, they are also different, and many here take great pleasure in the difference; after all, a garden is far more interesting if it is not all marigolds. Someone may choose a boutique product, like Poorboys or Zaino, based on a preference for the difference. One product's method of application might be preferable. Obviously appearance plays a big factor; for example, Zaino is designed to be involved (not difficult) in application, and it is highly reflective and has a reputation for outstanding durability. Price-to-value ratio is important.
So, yes and no. The products might be just as good, but you might like something else more.
Whatever you choose, though, remember: you wil get OUTSTANDING results only if you follow the proper procedures. A swirl filled car with 12 coats of Zaino will be a shiny t--d. A properly prepared car with NuFinish will look fantastic.
Tom