5 day embryo, 6 day embryo

We found out we have 5 embryos to freeze. 1 is a 5 day embryo and 4 are 6 day embryos. Anyone have an knowledge about the difference between the days? Good or bad? Everything I am reading is so conflicting and makes no sense. I need someone to break it down for me😂

Does one have a better outcome than the other? Is day 5 better than day 6? Hellppp!