I am loving this topic and I'll tell ya why. Every one seems to have a different opinion... and they are ALL the right one!
I think that's super!
I never wanted to use red for my regular entries, but I did use it for emphasis or decoration, and I find that I am the same way in my computer journaling.
Oh, and one caveat about using ballpoint ink. It is oil-based, and over time some ballpoint inks will disintegrate, making them hard to read on the paper becaue the oil will sink through, kind of like a grease spot on paper. Some of my ancient journals (30 years +) are nearly illegible. DON'T use a ballpoint!