Who is the faster and stronger hedgehogs sonic shadow or silver?

It would be Sonic the hedgehog.

Shadow uses jet shoes therefor cannot run fast.

Actually that's not true, both Sonic and Shadow are tied, and Shadow can keep up with Sonic even without his skates, but he prefers to use them anyway.

And where do you see Shadow run without his skates. While he doesn't necessarily use them in Sonic Riders, he uses extreme-gear like Sonic is using at the time. Though just because Shadow uses jet shoes does not mean that he IS slower, though that is most likely.