Grretings

Help me decide on a main class among 6 of my most preferred classes

I have these classes to fill up my 6 slots for the obvious reason to save energy and blackstone enchantment failstack

1. Warrior

2. Valkyrie

3. Sage

4. Maehwa

5. Ninja

6. Nova

I have mained one, but im willing to switch my main to any of these 6 classes 

Could you help me by giving your oppinion on the most fun class to main long term among those 6?