I have the high-res, and I like them because they come with MATs that let you darken the skin tones to several different shades, plus MATs for wet skin and skin sheen. You get a lot of options for your money. As I understand it, the low-res are the same, only smaller. So you could make your own low-res textures from the high-res ones; personally, I wouldn't buy both. The main limitation to DAZ's universal textures is that they are for a brunette. Even the fairest tone is relatively tanned, and the eyebrows and lashes are dark brown. They are painted, not trans-only, so they aren't easily changed. So if you want a natural blonde, these aren't for you. Otherwise, they're great.