Here are my thoughts:
-Firestorm //as her fiance// was a recent re-write, and Robbie was obviously not planned casting as his previous show was still airing/uncanceled when the Flash was cast. I do think he will be a permanent addition.
-Danielle will do either storyline justice, because based on what I’ve seen of her previous work, she is pretty good at establishing believable connections. I expect we will see good chemistry between her and Robbie, like we have seen with her and Grant.
-I still vastly prefer SnowBarry, because although the chemistry will be believable either way, the potential storyline for Barry and Caitlin is much more interesting to me. I don’t think we need ships that have two sweet, optimistic, do-gooders. I would love to see a ship with an archetypal hero and antihero.
Hope that answers your question! :)