The large pave
I think it is a great decision to wait a while before you pull the trigger. Both the frivole and butterfly are very beautiful pendants. Between the large and small frivole, the large frivole looks slightly better with the proportions of your earrings, imo. However, I really love the butterfly pendant with the frivole earrings. If you want a set, then the frivole pendant but the butterfly just adds a slightly whimsical touch to the look

Either decision you eventually make will still make a beautiful pairing with your frivoles.