Honestly? Just got with your gut. There is no real right or wrong way to do it, and overthinking it tends to just be that… overthinking it.
I know when I make my lists, I tend to power rank one or two of my favorites in the Top 3 or Top 5. Captain America: The Winter Solider is always going to be #1/Full Ten Points for the BOT Top 100 followed by Singin In The Rain at #2.
After that I go based on a weird mix of “things I think the boards like, things I know my friends like, movies I think need more love/might be over looked, and actual order of my favorite movies”
Like I said, just my gut.