As you have already noticed, company Gore makes not only a membrane (fabrics) Gore-Tex, but also a membrane (fabrics) Windstopper. The basic difference of these materials consists that last is specially designed for the maximal protection against a wind. The basic functions of membrane Windstopper do not include exclusive protection against a moisture, therefore all clothes from this fabric is processed by the special structures which are not supposing water inside of clothes.
This surprising property, became accessible owing to a special structure of a material when a stream of air (wind) outside meets a reliable barrier in the form of a membrane, and pairs from within is free through it passes.
As well as the clothes with gore-tex, and these clothes pass set of tests before getting on shelfs of shops. Among them such as:
1) Check in the rain chamber within several hours;
2) The test for permeability a wind at which it is checked that no more than 372 ounces of air passed through 1,2 square ярда fabrics in a second. It is the accepted parameter of tightness of a fabric. Fabrics Windstopper guarantee passage of air to second NO MORE than 169 ounces (!);
3) Check on permeability pair at which "breathing" ability of a product within 24 hours is checked;
From all aforesaid it is possible to draw a conclusion, that if the clothes for campaigns in places with wind (mountains, sea coast, plains, descents to mountain skiing are necessary to you, etc.), the clothes with membrane Windstopper is better will approach. If the rain and much, for example, is planned dew (a wood, an alloy on the rivers, sea walks, sleet, etc.), you receive the maximal protection in clothes with membrane Gore-Tex.
Gore-Tex: Gore-Tex Performance Shell; Gore-Tex Pro Shell; Gore-Tex Paclite; Gore-Tex Soft Shell.
Windstopper: WINDSTOPPER Active Shell; WINDSTOPPER Soft Shell; WINDSTOPPER Technical Fleece; WINDSTOPPER Insulated Shell.
More in detail about these kinds of fabrics and their characteristics here