IMO, Candice and Angie's performance was good, especially for AI standards, but Rihanna sang the song with more emotion and her performance was more chilling.
I didn't like the Idol performance at all. They were more concerned with showing off powerful vocals rather than feeling the lyrics and Stay is definitely not the song to do that.
for them promoting Stay. Second time it's been promoted on Idol this season 
Angie and Candice by far.