Those Donic rubbers you have, the sponge is springy, the topsheet is smooth, it doesn't look like it is supper grippy till the ball is on it right? But when the ball is on it, it grabs the ball. But if you pull the ball away, it comes away, it doesn't stick, right? Those are European rubbers. Those are what European and Japanese rubbers are like.
Traditional Chinese rubber, the sponge is sort of like cardboard unless you boost it. The topsheet is a bit like fly paper. If you leave it out, it will have a bunch of dust and dirt particles collected on it, some string, a few small particles of paper, you name it. After you clean that stuff off, if you take a ball, put it on a table and place the racket with the Chinese rubber over it and press down, you are most likely going to pick the ball up because the ball will stick to the topsheet.
The topsheet is called tacky, or sticky.
The two types of rubbers work equally well. They just work differently. European rubbers, the sponge and the topsheet work together to spin and catapult the ball. Chinese rubbers, the sticky grabs quite well and spins the ball and propels it forward more from the topsheet than the sponge. The firm sponge makes it so you can use the topsheet more.
But it is sort of 6 of this and half a dozen of that in terms of which is better.