Is Zotac an inferior company than Asus, Gigabyte or MSI?

Solution
No, they are mostly not inferior. Zotac has an excellent engineering team and they do cool things.
I personally recently switched to the EVGA for the GPUs as they have the best warranty terms and excellent support.
In fact, Zotac AMP! Extreme cards are awesome and can be compared to EVGA classified/FTW only.
Regarding the pricing - Asus is top tier vendor and the other two are "wanna be top tier", so they set the pricing accordingly.
I don't like the GB engineering and cooling solutions as they were very loud (no recent experience though).
No, they are mostly not inferior. Zotac has an excellent engineering team and they do cool things.
I personally recently switched to the EVGA for the GPUs as they have the best warranty terms and excellent support.
In fact, Zotac AMP! Extreme cards are awesome and can be compared to EVGA classified/FTW only.
Regarding the pricing - Asus is top tier vendor and the other two are "wanna be top tier", so they set the pricing accordingly.
I don't like the GB engineering and cooling solutions as they were very loud (no recent experience though).
 
Solution

Tradesman1

Legenda in Aeternum
Zotac cards are very good, and their pricing reflects there wish to grow the brand as they are still a relatively small manufacturer trying to find their niche. For nVidia cards I normally look to Asus and EVGA as the top tier, have used other brands including Zotac, but tend to keep going back to EVGA and Asus for primary choices