For most crochet the right side is determined by where you started. Because most crochet produces a stitch that looks the same (or nearly so) from both side like a garder stitch does in knit.
Popcorns, puffs, picos, and front (or back) post stitches have different front and backs just like a st st does. Any you may choose the WS to be the RS like rev. st st.
So, the answer to your question, Crycket, is that it depends!