Bard or Enchanter (or x) for...

[Hrothgaar]

...support in "dangerous situations"?

This question is a little difficult for me to formulate.
I am looking for a support class that is viable in many different "situations of emergency" and that has the potential to heavily impact grave situations.

I am not so much looking for advice on which class has a situational tool like for example Paladin's Lay on Hands ability but I am looking for the class that has a core "when the shit hits the fan" skillset that is needed when the fight gets out of balance.

From what I read an Enchanter and a Bard has for example the Mesmerise Ability, which would fit what I was looking for quite nicely but which of the two classes would have a bigger impact on these "oh shit!" moments in terms of usefulnes and flexibility given their full skillset? Which ones impact might be bigger?
Is there another class except of Bard / Enchanter you can think of that falls into this category?

(Let's assume an equal player skill and ignore the constant need for klicking for bards.)