I use moleskines primarily just to have something on me, but almost everything I do on them is pencil drawings. They do feel nice for inks, too. I also sometimes go for brown-papered sketchbooks (last one I got was from Utrecht bc I lived right next to one). It's fun to be able to pencil-sketch in both lights and darks!
If I want to do markers or watercolour sketches, I use the Canson mixed media sketchbooks (both the blue and yellow ones, yellow is more like Bristol). They hold up pretty well for watercolours, I've almost never gotten any warped BUT I am definitely not heavy on the water like you are. The Stillman & Birn watercolour sketchbooks are my fave, they have a variety but I tend to go with the rougher-textured ones so they dry out quicker (I paint in layers, I am just an irredeemable printmaker). I did all of my small illustrations for my thesis in an S&B book! They'll definitely hold up to water-heavy art with little to no warping.
For prints....I'm kind of a stickler for Rives BFK. It's expensive af I know, but it's so smooth and soooft and takes water so well. I can even soak it and stretch it out on canvas bars! But rag paper of any kind will do. Stonehenge is definitely the cheaper option and it's good too, especially for screenprinting and relief (woodcut/linocut). I don't particularly like it for etching or lithography though, it's a little too slippery for those imo.
HOWEVER I do absolutely LOVE to hand-press reliefs on some thin, natural/handmade paper. Mulberry is absolutely the best for those. The last series of prints I made before I left the studio to work on my comic were hand-printed on mulberry, it gives such a great texture and really soaks up the medium. Recommend for brushed ink pieces too!
