I love comments the most, because who doesn't like actively engaging people about their work? Even if it's just an 'aaah this is cute' or something along those lines, its still satisfying to see you've evoked that kind of response.
Otherwise likes -> subs -> views, but those go hand-in-hand, because sometimes you have a lot of subs that clearly haven't read your work yet, even if it's an unknown proportion just because the views don't align.
I'm only a ghost subscriber when I haven't gotten around to reading yet, because I use subs to bookmark stuff. I make an effort to comment/like everything I read (I also like engaging with the creators a lot more than when I was just a reader, because I know how excited I get when people comment my stuff so I figure I'm not bothering anyone)