I'd personally go with naruto (mainly part 1[due to the story being far better than half of part 2 and how all the villages were at war with eachother and most missions you'll come across enemies from other villages and it felt more like an actually ninja series than just spamming bijuu bombs & jutsus]
& 2 [ Mainly cause part 2 had better emotional parts than part 1])
Part 1 is very consistently good. It feels like Kishi really developed the lay of a complex world with a complex storyline, and you could feel that he really had some big plot points laid out early on.
I'll like to have it where you start out as Academy student and work your way up to genin, chuunin, jounin,special jounin, anbu, s-class, and kage.
and during the beginning of your journey throughout your ninja journey you get to choose what clan you want to be in and what chakra nature you want. so having picked being an uchiha you get to possessed sharingan which is an kekki genkai and most clans do have their own.
While I do like the earlier parts of one piece and beginning your journey out to sea as you try to aim to be the pirate king or just to find the one piece.
their are even more series i'd like...for insistence Hunter x Hunter, Fullmetal alchemist brotherhood, My hero academia.