I think it's kinda my duty to inform everyone that I have the elusive 41 daggs

The spirit daggers are somewhat useful at lvl 41+, they also give a hidden 300% stacking DMG during proc, in addition to HP. (200% before 41)

Are they better than pisc? Not exactly, pisc+ sunk/krak still better than spirit dagg + sunk/krak. The upside is that you can proc spirit early before fighting unlike pisc.

Are they better than krak? Absolutely not, and it's not even close, sry not sry lol. The reflection is at 200k per enemy hit on the higher end , and 50k on the lower end. (And you still take DMG, it doesn't change mechanism to smt like anky where it gives a barrier).