For the first question let's see. It's not so important unless you want to NP every turn. She gains it like nothing and so it isn't really much important, bit it's there to balance her out since she can gain so much NP.
For the second question. Do you already have her? Still with cu alter and Jalter I'd go for Merlin still. Why? His NP buffs could stack and could literally spam it. Charging your NP and getting stars wouldn't be hard anymore which is why quick became a meme. I'd say just go for Merlin since there's quite a few tamamo out there for support and she's a lot more available due to being in the story and more gachas and Merlin if I remember was out two or three times only.
Dunno what you really want but this is my opinion.
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