There have been rankings made by some of the block producers, and also by people on Reddit and on Youtube.
https://trybe.one/who-to-vote-for-in-the-eos-block-producer-candidacy-election/
https://www.reddit.com/r/eos/comments/8nqwsb/best_21_eos_block_producer_research/
This might be useful :)
RE: How to cast your EOS vote