#fountainpens
since I'm using them for my #bulletjournal I haven't gone back to fineliners at all.
I loved fineliners for sketching, but the tips were so fragile. Often the tips would just wear down and then they weren't writing as smoothly as if they were new.
with fountainpens, this is a problem of the past! and the waterproof inks which are available now make them absolutely sketching-proof!