Really it depends on you. When someone asks who you like, who pops up in your head first. When you are around your friends, who do you talk about more. That's what helps me decide. Idk if it will work for you or not.
Choose the one you had after your og crush, because the only reason you have fallen for someone else is because you're starting to lose feelings for the first one. Or pick the one who is more kind and caring. They are more trustworthy than the other.