Personally, I don’t think anyone could compare to the Lisa Kelly version. Her voice is sheer, ethereal majesty!
However, I think both Susan and Alex have good approaches to the song. Alex’s voice is very unique and more emotive, especially when she sings “Give me your peace and my wounds, they will heal”, and Susan’s musical-theatre style makes it feel like a fantasy film! I also like the Gavin Murphy arrangements with her voice, it makes me think of Dungeons And Dragons.
Here’s the Alex version:
https://youtu.be/04fODKc6vxI?si=hIX9G8fW1iU-kthe