My favorite fonts are ones that are available on my devices. There is no option for me to use anything else. I have used caecelia since my first ebook since that is all that was on the first kindle.
. I still like that today, although I often use bookerly now as I like how its set on the page overall better. But caecelia has a bit more boldness to it.
So caecelia and bookerly are my favorite fonts to read with.