Rakza Z is more linear, i.e. the slow shots and the fast shots are directly proportional to the force you exert, while the Dignics 09c has more of a response that when you do a weak shot it is very slow, but the forceful shots have more zing to it. The 09c has a higher top speed than the Rakza Z. At first I could not pinpoint what the difference is because they are very similar. 09c is slower on the slow end, and faster on the fast end. 

I find it more enjoyable to use the 09c because the higher gears has a satisfying click + speed boost, but the Rakza Z is more controlled in my opinion, so it depends on what you are going for. I think in the end Rakza Z may win me more points my getting my shots with placement and on the table more times, but the 09c will have more put away power and the slow spinny loops are quite spinny. 

On slow loops, the 09c will have more spin.

Rakza Z behaves more like Hurricane 3 Neo Prov Blue Sponge, with a big difference: the throw angle of Rakza Z is much higher than Hurricane. The top end speed will also be faster on the boosted Blue Sponge.