I am aiming to yasaka rakza 7 soft and Nitaku C1.
Does Nitaku C1 has low or high arc - like BF 05fx?
Much harder than BF 05fx?
I agree with Lazer that all ESN rubbers are probably similar to some degree.
I have one bat with C-1 on the BH. Another bat with Rakza 7 soft on the BH. Both bats have the same blade (same maker, same model). I really could go back and forth between the two blades and not miss a bit. C-1 is just slightly less catapulty than Rakza 7 soft. Their hardness is about the same, i.e. they are both pretty soft.
As for arc, I never understand that concept. The arc depends on how your strokes are. I play with low arc. My top spins usually barely go over the top of the table but that's because I grew up playing Chinese rubber and I play close to the table.
So I am going to say, the arc for both C-1 and Rakza 7 soft is just fine. Enough for me to clear the net with my backhand loop to score the point and not high enough for the other player to smack the heck out of it (afterall, with soft rubber, you do not exactly have the highest gear in terms of speed when you push the rubber to its limit). I like the control of the soft rubber. Over the table game is also important to me. Easy blocking is nice too. Whenever I blocked with T05fx, that ball just keeps on flying off the end of the table....