Exactly, Miranda heals when needed and joins the fight when everything is fine, whereas Kain keeps on spamming his healing all the time and never using his shining fist or whatever it was. But really, her best selling point is the status healing.
What’s the track called when you fight Aphelion on the human side? It was much better than that of the fairy side.
edit; while using Miranda, I noticed that almost never did she stay behind the party and heal; she was always in the fight. I ended up being the healer myself on a lot of occassions.