Platinum Preppy lol. Just a good knock about pen. Currently I use my other pens pretty interchangeably for letter writing and journalling. But the Preppy takes the cake for the most general use. Second to that would be my Pelikan Twist since it’s also a nice knockabout pen and with a medium nib (Preppy is F), I use it when I want to jot something down that really stands out with thicker lines.
My spouse’s Hongdian Black Forest has a very satisfying cap. I’ve sat there uncapping and capping over and over just cause it feels so nice lol. I don’t normally like really hard nibs but it writes so nice I secretly covet it. Its also been super reliable.
If you don’t mind second hand (since they’re not made anymore), a Pelikan Level has the most enjoyable closing cap I’ve ever experienced. Albeit It’s a sightly unusual but unique looking pen.