Shadow is both stronger and faster than Silver the Hedgehog. As seen in Sonic 06 where Shadow beats Silver in a fight after the Radical Train level.
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Sonic is faster although silver has a bit more physical power but when they are both super sonic gains far more power than silver therefor making sonic stronger
Shadow is suppose to be stronger and faster But I like Sonic better.
The Flash is without a doubt faster than Shadow the Hedgehog. The Flash can move so fast that his molecules can separate allowing him to destroy the fabric of reality.
Sonic and Shadow are tied, many people criticise Shadow's skating and that he can only keep up with Sonic using them, but it has been proven that Shadow can keep up with Sonic without his skates, he just likes them better anyways.
If you have watched the Sonic X episode where Sonic faces off with Shadow, they would be the same speed. Sonic has his shoes that make him run really fast, where shadow's trademark hover shakes propel him at extreme speeds that rival those of Sonic.