Right now ast beats whm in every single category.

Has shield,has more ogcd heals ,has heals that are strong as whm. Ast identical heals to whm such as benefic and helios not only cost less but even casted faster and lastly have better mp management and tools then whm.

in terms of healing alone, ast beats whm completely and that ignoring his cards and dps aspects they have. So whm will be a rare breed i believe as ast was at 5.0