The SP-01 is similar to the Shadow, but they are not identical. the Shadow has a number of internal and external changes to the basic SP-01 to make it a better competition platform (fibre optic sight, different safety, no firing pin block to name a few - do some searching and you'll see).
I think both would be an excellent pistol. they hold their value well, they're solid, accurate, reliable and make for easy shooting. the full-steel construction soaks up 9mm recoil very well. There's a reason so many IPSC shooters use the CZ-75. You can't lose, in my opinion.
As for any firearm, though, you need to actually go and hold one before you make up your mind. Good luck, and hopefully you settle on something you like.
(I should add that I own an SP-01 and i've been extremely pleased with it.)