I wanted to be as fair to Shae Celine as I possibly could and so I looked her up on YouTube and came across this series of videos that she has made with a series of different backing groups -
You may find it interesting to see and hear her in a variety of musical settings.
She's made strides in the 6 or 7 years since she appeared with Craig Chaquico but I think that there are significant differences between her performance and that of Stephanie Calvert.
Calvert found her own unique "voice" early and then reinforced it with professional training to perfect her technique but at the core of her talent lies that unique "voice" - One which allows her to effortlessly express a much wider range of emotions.
She approached her role with Starship much as an actress would - She was faced with having to make a decision about how to assume one of popular music's most iconic roles - that of Grace Slick - She was faced with a choice, to either do a straightforward "impression" which would please most everyone or to be more - to be both an actress and a musician - to do an "interpretation" of that role - One that would do honor and be respectful of a significant legacy and yet would allow her to expand upon that role and thus change "craft" into "art".
Listen to her rip right through "Somebody To Love" - She's just absolutely fearless - almost fierce - in her intensity. Her phrasing, her delivery, her new variations on a well-known time-honored theme are a wonder to behold.
I watched 7 or 8 of Shae Celine's videos ranging from straightforward lead singer with backing band to tier 3 musical theater productions to duets. She's better now than she was then - considerably so - but I'm not entirely convinced that she has found her own unique "voice" or if she ever will. She certainly has the necessary requirements to take on that mid-level lead vocalist role - She has all the tools - I just don't think that she has a tool-box. She does have a powerhouse voice - Stays in tune - and has a fine sense of how to express her physicality onstage. I just don't think that she's really using her own voice - You can clearly hear her influences when you watch the soul tune covers - Aretha Franklin and Chaka Khan in particular - but I can't really hear anything that distinguishes her from any number of other singers. She's doing "impressions" rather than "interpretations".
I don't know if either one of them can actually "act" in the literal sense of being able to be a working actor on or off- Broadway - Calvert definitely has the kind of voice that can hit the back rows - She could effortlessly sing "Let It Go" from "Frozen" for example without keeling over and gasping for air but I can say, with confidence, that Shae Celine just does not have have that kind of big Broadway voice - and wouldn't even be considered for a role as an understudy. When I listened to Celine doing a couple of tunes from "Beehive" a tier 3 level regional stage production held at the "Oregon Cabaret" you can see that once she stops singing she's completely lost never more so than during the interview.
And so.... The final verdict - the victory goes to Stephanie Calvert with Shae Celine receiving an honorable mention.