At 65lvl edo tensei treasure opens up, where gnw1010 is a common pull. Iruka can be obtained through ninja frag refining. If you want, in time you will get both for free.
They both are ok, and they both serve different purpose. Iruka is used with konoha teams for shield, 30/30% buff and interrupt. Tenten is used when you need aoe dmg, she works well if you can utilize her mystery 1st round (so u need some source of chakra gain) as well as her 3 chases. Both can work for 9tails, iruka might be slightly better. Personally havent seen many wind mains using either of them in normal play.