Irrepressible vs Luminary soul shield

[Stormy Kitty]

For my Astromancer, I currently have the Irrepressible SS. I also have the 8 sealed pieces of the Luminary SS. Is the Luminary SS better than the Irrepressible?

 

Also, is the "Way of the Luminary" achievement worth expending 40 unsealing charms to get?

 

[Cor]

Just look where it's obtained from, if it's from a higher raid it's better. Or you could have just unsealed one and compared stats, sealing charms aren't worth anything.