Well Sailor Sakura, Roshi, and C Hidan are all amazing ninjas that you c*e not only in your primary team but in Ranked, Matsuri and so on. I disagree with 101 saying NEITHER. Yes Masked Obito is great and used a lot, but somehow people think he is the most awesome thing to come after toast bread.
He is a nice ninja, but nowhere near SUPAH AMAZING. You can wait a bit if you like to check when he comes, then decide if you want to grab any of those 3 you mentioned. Roshi is definitely an amazing investment and an end game ninja.
Hope I helped. Have a nice day!