WAR or PLD?

[chocomaid]

Active tank, most of the abilities and CD work without you worrying about anything. If you want ease, go paladin.

Reactive tank, depending on what/and how much is hitting you, you need to pop and do certain abilities to survive and mitigate damage. If you want fun and slightly, just slightly more challenging tank, go warrior.

I don't want to spoil the story for you on either so can't comment on those since you are only level 15 on both.