My friends find it strange that I put so much thought in my climbing underwear. I find it stranger that they spend €€€€ on top-end fleece and Gore-tex jackets that won't do a thing to keep them dry if they wear conventional cotton underwear.
I've been using Lowe Alpind Dryflo for years. I was given this one as a present and it's a great improvement over the older models. The new fabric is smoother and it has different density on some (hotter) areas to help breathability, which is really good. The seamless design is really comfortable.