The name of a carpet or rug does not tell you anything about the quality or value. All it tells us is the origin, such as the tribe who made it (e.g., Qashgai, Belouchi, Kurdi etc.), the village or city (e.g., Tabriz, Bidjar, Shiraz, Hamadan) where it was made, or the city or market town where it was marketed (e.g., Shiraz, Teheran, Meshed).
Therefore, it will be wrong to decide value, merit or what to buy based only on the name of the carpet. Your judgment of what to buy must be based on your heart’s desire, what speaks to you and brings you joy to look at. Further, also consider if you will achieve the decorative effect you wish and if it will have the durability you require where you intend to use it. The higher the quality you go for, the longer the lifespan you will get from it — with correct care.
Any one name can represent different grades of quality for rugs or carpets crafted from the same place. They can, and will, vary from mediocre, to fair, to superior, to outstanding, and will be valued/priced accordingly. The rare, good antique collector-piece or museum-piece examples can be valued in the tens of thousands, hundreds of thousands — even millions of US $s.n
A good analogy is wines from a given area. Are all Burgundy French wines, or Stellenbosch South African wines of the same quality or value? Of course not. The same would apply, of course, to original paintings, other works of art, diamonds etc.