Roshi's popular right now...but it won't last.....there's a new trendy, must-have ninja every few months

Personally, I jumped on that bandwagon with Edo....and in the long run, it hurt. I got the super rares and the others from that treasure, but don't have any flexibility for team-building.

I recommend you go with Kage. It's what I should've done, and what I think you should do. It'll help you develop a stronger and more reliable foundation.