WHM or SCH for you..?

[Cynfael]

Hum, not sure to understand, by Solo content I mean Solo healing HL content as SCH, not solo content as FATE or quests.

I see what you mean. In that case I'd say WHM has the advantage if the party takes a lot of unnecessary damage (e.g. if people can't dodge properly in Titan Ex). SCH has the advantage if heavy tank healing is all that's needed. Otherwise they're equally capable.