My favourite is White Mage I think the main thing I like about WHM is that it can focus on healing and is quite a strong solo healer - I like seeing how far we can get into an encounter with only me and a fairy healing.

Second favourite is AST because I like being able to support the raid and heal, though sometimes I find the cards distracting.

Least favourite is SCH because I don't like the aspect of healer DPS. Each to their own though