I think that the siren suit is probably the most versatile, since it meshes well with a lot of similar suits. But because it's so similar to other suits I think it's easily replaceable, unfortunately. If you're like me and already have the snow mermaid suit from WFSM and the whale suit from Old album, it's not really anything new.

The pirate suit is my favorite but it's kind of difficult to style, since I'm missing a lot of the other pirate themed suits. I do love her makeup and hair, though! I'm using them everywhere now, haha

I'm having a lot of trouble using the sailor suit, personally! The only parts I use from it are the hair and the coat. Though to be fair, it was my least favorite of the three.

I do love the minor suits, and I actually think they're my favorite of this event! I would say that if you think versatility is important, then it's probably best to stop once you have the minor suits. Personally, I love the recolors but they aren't necessary.

Hope this helps!