The point in wearing a wig is to make it look as natural as possible. As we can see in the picture attached below, the HD lace known as Swiss lace is more see-through than normal lace, which can melt into scalp better, and make our hairline looks more natural and less visible.
HD lace is a new name of Swiss lace, a kind of lace that is thinner and more see-through, and transparent lace is the regular lace in transparent color.
We often recommend the transparent lace to light skin tone girls, but recently we found that transparent color lace can melt to any skin tone after we bleach the hair knots and glue down the hairline.
But according to the features of the lace material itself, HD lace (Swiss lace) is still much thinner, more delicate and transparent than transparent normal lace.