It depends, I REALLY like paper.
I’ll keep the answer dwindled down to book printing (because this answer would get longer other wise).
For books, I try to chose paper that suits the story and so I tend to spend toooooo much time selecting paper. Until recently I hadn’t settled on a brand, but if your thinking about making books, I’d recommend any paper from Mohawk. They are just beyond beautiful and very affordable. If you’re looking for some nicer reams of paper and can afford to put a little more capital into your project, I’d suggest French Paper Company. They have some GREAT paper colors and the paper texture is JUST! UH! it’s great! (Did I mention I like paper?)
Ahem! On to specifics (lol)! For books like Monster or SUB- vol1 I use Mohawk i-tone paper (65 cover weight) for the interior and then a Canson Colored Bristol for the covers (they come in sheets of 22x30inch I’m pretty sure). For How to Feed Dep. I use a glossy magazine paper and then a cream bristol from Wasu (Also a decent brand) for the cover (cover stock weight). Circle is printed on epson doubleweight matte for the interior and some light weight paper that looks like it’s made from paper bags (I can’t remember what the paper is since I bought the paper some time ago).
I think that’s all the paper stocks I use for books. I hope this answers your question?