I keep an almost-daily journal, in longhand, and, until very recently, with fountain pens. I have a goodly number of journals on the bookshelves, although I don't know why anyone would want to read through them. Pretty ordinary. When visiting my son in NYC last summer, I found some outstanding roller ball or ball point (hard to tell the difference) pens made in Japan. One version is by Pentel, the Slicci. They have amazingly small points, like 0.3mm and 0.25mm, the ink never smears or blots and flows smoothly and consistently, and, unlike many fountain pen inks, dries almost instantly. No smearing.
I have the Slicci and a couple of other Japanese brands in 0.3mm and 0.25mm, black and blue ink – they come in many colors of ink – and I now prefer them to my fountain pens.