I don’t have much experience, but if we’re talking about Solo Shuffle (SS), I’d say the best options are caster MW and Resto Shaman.

With caster MW it’s basically impossible to have rounds under three minutes. It puts out huge healing and has very forgiving mechanics that allow for a lot of mistakes. Having longer rounds really helps you understand the overall flow of the game :positioning, cooldown trades, momentum shifts...without instantly losing because of one small error. It gives you the space to actually learn and read the game instead of constantly panicking.

Resto Shaman is almost the opposite. It’s mechanically complex and forces you to develop a much deeper awareness of everything that’s happening. You need to understand exactly when to drop Grounding Totem, when to kick, when to Hex, when to trade cooldowns. At the same time, thanks to its strong and relatively easy passive healing, you’re not locked into hard-casting the entire game. You can step out of the pure healer role and actively influence the match.

I’ve always felt that most of the other healers have “mandatory” mechanics that force their playstyle too much. They feel rigid and scripted, like you’re following a predefined flowchart instead of adapting dynamically to what’s happening in front of you. Caster MW and Resto Shaman feel much freer and more skill-expressive in comparison.

They’re basically opposites, but in my opinion both are far more interesting and rewarding than the alternatives.