That pretty much depends on what you want for your future teams. For me, I never burn extra servants until they're NP5. There's nothing in the RP shop that I'm absolutely dying for so I'd rather just increase the NP level of my servants.
That said, I don't believe Marie and Chevalier gain a whole lot by having a higher NP level. If you have no plans on using them, yeah it's probably worth it to burn them. Siegfried is worth it, on the other hand.
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