Tyrant V's Dagger Exp'n

I have a sub-class low 6X.. and have become a little bored with the Tyrant and was considering switching to a Treasure Hunter

What is the leveling speed like in comparison.. ?

Would I be best to see the Tyrant through to 75 or switch now to a Treasure Hunter?

Get your Tyrant to 68, XP at 30% hp is INSANE, even 60% is good. Tyrants are great DDs, and challenging to play.