I put all my points in MND for both so my heals are bit bigger. For WHM, some people put them in either VIT so you have more health, or PIE so you have more MP.

When you get a chance, level THM to 28 (?) so you get Swiftcast, an invaluable action for healers as it will enable you to instantly raise a fallen member, summon your pet straight away, etc...

Both are viable healers in their own right. Personally, I favour SCH. Due to all the attack spells from ACN, I like to Cleric Stance dance and throw all my Dot's on an enemy and Bane, then go back to healing as needed