I use any kind of cheap peace of paper for my daily journalistic work, usually a spiral note book out of the supermarket. They might not endure this century, who cares?
I also use digital notes and digital recordings on the I-phone for interviews, in former times on cassette.
I had some moleskin as journal a few decades ago, and some of their scetchbooks for pencil drawings and adress book as well. They do a good job, quite durable. But I am not that romantic about writing down my whatever thoughts any more. I am not Immanuel Kant, so I skipped the luxurious approach.
Leuchtturm 1917 seems to me a little bit overpriced same as some pipes.
If I would care, I maybe would go for moleskin or its No name clone, I found recently, that is much cheaper of similar quality. Also here you may find parallels to pipes.
As always just find the best materials and experience that make you feel comfortable and happy.