1) Alex Toussaint - I probably do 75% of my rides with him
2) Emma Lovewell
3) Robin Arzon
4) Ally Love
5) Olivia Amato
They are all good but they're different in terms of the music they play. The types of rides they do, how much they talk, etc. I would recommend doing the intro to peloton series of classes on the bike to try out the different instructors and see who you like the best.