A few months ago I spent a lot of time scouring font sites for something that was relatively compact and would remain easily readable at a small size. On my Project Life pages I have sooo much text to squeeze in! My favorite ended up being
KG Thinking Out Loud. It looks like a chunky, big font, but it can go surprisingly small and still be very easy to read.
I also use
Hollywood Starfire a lot. I think it may have been from an SSD challenge a few years ago. It's easy to read and fits on lots of different page styles, but if I test the same text in this and KG Thinking Out Loud, I can fit in more text legibly with the KG font.
I use these fonts for almost all my journaling. I also don't use scripts, except maybe for a word or two in titlework. My kids find all scripts much harder to read than print and at small sizes I think they're usually hard to read.