Level 13 & 16
HEALING: "Spell Shield" over "Relentless"
- This is hyper-situational: I generally take "Spell Shield" to decrease damage and/or if the enemy team has a lot of burst. But if the enemy team has a lot of CC, I'll take "Relentless" to help me be more mobile and to escape. If the CC is minimal, just wait until lvl 16 to get "Soothing Breeze"
- "Quicksilver" might come in handy if you're facing someone who is super mobile like Illidan, Tracer, Zeratul, Falstad, etc. Basically, any hero that can catch up to you quickly.

Level 20
HEALING: If you're new to healing and/or Kharazim, I would suggest taking "Peaceful Repose" to lower the CD of "Divine Palm", until you can get batter at targeting with and timing it. Once you do, "Storm Shield" is your best bet as it provides longer sustainability and those precious extra seconds to win team fights towards the end of the game.