Originally Posted by
Rivxkobe
This is not what is being asked though.
OP wants to know what Healer/Tank is the easiest for them to start as after using Three DPS, not which healer is the most straight forward. With SCH both coming from a DPS class, and having their Fairy, they are both the easiest to level as/use in low level content and the easiest to start with if transitioning to a Healer class from using only DPS classes. Just because WHM is the most "straight foward" does not make it the easiest, and definitely doesn't make it the easiest Healer to use for one who only knows DPS.
Granted they are going to have to Conjurer to pick up core Cross Class skills, but that's a whole other thing.