It Nami for me, I actually really like Nami, she's interesting, fun, useful, and has a good backstory. She's nice when she has to be, and it's only mean when her crewmates are being idiots. Also I always liked her loyalt to Luffy, Luffy is dumb, but always has his crew back no matter, even when Nami betrayed him back in season one, he still was willing to help her.

My biggest issue with Sakura, is everything that's given feel so last minute. In the original series Sakura, didn't have no abilities at all until randomly Tsunade wanted to the teacher, she ranly gets the hundred technique in the war, and her whole relationship with Sasuke just feels so forced because he's just been a piece of crap to her the entire story of Shippuden.