Smoothe, both for pencils and inks.
I've been using smoothe ever since I started inking, which was about a year ago, and it's excellent paper. Then for my birthday, I got some vellum, and I tried inking on it, but it was hard to lay down ink, and then I tried pencilling on it, and the lines came out thicker and it was more difficult to add small details. I also had to sharpen my pencil every few minutes because the tip kept wearing down.
Smoothe, for me, is great. You can go crazy with detail, it's good for pencil, crowquill, and brush, and it's easy to erase off of. The only problem is that if you put your hand over the page, you'll smudge the pencil a great deal. I'm left-handed, so the top left corner of the pencilled pages are always lighter than the other areas, because of my hand going over it.