Which one is better?
Well, if cost is not an issue, the ranking should be Singh-ray, Lee, Hi-tech, cokin and tian ya. But has anyone has the estimated budget?
Beside ND and GND what are other filters that is necessary?
ND has ND2, 4 , 8 .... etc
GND hard and soft
What about sunset etc?
Also, normally which type of material is better? Polyester, resin or glass?
Any user uses combination of e.g.: Cokin P holder with other brand's filter before?