? Difference btw xiom omega 4 asia and razka 7

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hello tt players i m now playing with omega 5 asia.i dont like this b/c it is hard to execute topspin to underspin .my lovely is omega 4 asia except less spin compare to soft sponge as razka 7.is razka 7 can give me omega 4 asia speed and more spin.?the main reason of my choice to omega 4 asia is changing arc after bounce. Should i change to rubber?
 
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