I've never played a Mystic but I have an 85 Inquisitor. To be honest, I found her boring to solo but as a duo with either one of my husband's tanks or my Guardian mercenary I have a good time. She is great at healing and curing and while she can dps, it's boring compared to a melee class (which is what I primarily play).
My husband's Mystic is a beast compared to my Inquisitor, I think. The wards are fantastic, he can heal as needed and has nice dps. From what you've described I think that may be the route you'd want to focus on first.
Hopefully someone who has played both classes firsthand has some more input for you but I hope that helped!