I own a SP-01 and two P226s so I feel that I can comment on the pros and cons of each. I would also like to say that the Sig P226 is an all-metal gun...last time I checked aluminum is a metal (it's a 7075 T6 alloy, same as a high-quality AR15 or 92FS).
The CZ:
Pros:
Heavy gun soaks up the recoil
Extremely durable
Low-bore axis
Parts available to make it a great gun
Everybody says they feel great in the hand
Cons:
I dislike the small slide, makes it hard for me to grip (I get sweaty hands), so if you compete and your hands slip or don't get a 100% firm contact with it, it may make clearing a jam or cycling the slide more difficult.
The trigger is gritty out of the box. I got a local gunsmith to tune it up and he did a great job, now it's the nicest trigger on any gun I own.

They're not as nicely finished inside as a Sig
P226:
Pros:
This gun will eat anything.
Insanely reliable
Easy to field strip
More refined feeling
Cons:
It's an aluminum-alloy which means it won't last AS LONG as the steel CZ, but unless you exceed 60 thousand rounds or more I don't know if you'd know the difference
More expensive
More maintenance intensive because the frame rails need grease instead of oil to protect the anodizing
Might be harder to find parts like recoil springs, for.
I also have a P226 all-steel which makes a .40 feel like a 9mm.
If you want a gun that will make recoil feel nonexistent and like a hefty gun, get the CZ
If you don't mind spending more on the gun and more time on maintenance, and like a smoother gun that's insanely reliable, get the Sig
You will often hear people say, "Sig's quality sucks," but any time I ask for examples, I don't get them. The one gripe about Sig is the Checkmate magazines. Why Sig? Get the Mec-Gars, which are OEM on the CZ and are available for the Sig.