Why oh why can't I seem to pick which one I like better?

Technically, I do better holding aggro in dungeons as a Glad. (Surprising)

I can't get over the fact though that I also like to do solo stuff like Fates/Bosses when no one is available to help. This is where I feel like I should be playing a Marauder for the damage and healing.

Is the Marauder damage and healing enough to make me soloing as a Glad laughable?

TL;DR - Is Gladiator damage and healing way lower than Marauder? (Also applys to Pala vs Warr)

Thank you!