You don't say what you'll use it for? There's a significant difference in size and weight.
Many don't realize that the SIG P228 is fielded by the U.S. Military as their compact semiautomatic pistol - the M11. It's designed to be carried with a round in the chamber and hammer down, and is proven safe in a wide range of law enforcement and military applications. The government pistols come standard with Siglite night sights. If M1911A1's and Beretta 92's are any indication, this pistol will retain popularity for a long time. It is far more suitable as a CCW weapon and in most tests, significantly more accurate than run-of the-mill 9mm's - 2.4" average in a Guns & Ammo test.
In government testing, three P228's were fired 5,000 rounds each They were allowed 17 stoppages to pass. One of the pistols had a single malfunction....
For the price of $625-675, SIG owners expect them to be perfect, and SIG customer service treats them that way. SIG owners aren't stupid and expect to receive value for the money. The 228 has been very hard to impossible to find on the civilian market, because of government and LEA orders, did you find a used one?
M11 article
The CZ 75 is a good shooter for the money. If you are buying the standard version, 75B, it has a manual safety and firing pin block, which many people prefer for a range pistol. It does not come standard with a decocker, though a model is available. As an all steel pistol, it's large and heavy, which helps reduce felt recoil. Now that CZ has a U.S. operation, parts are readily available and there are also a few holsters available and gunsmiths who will work on them. Despite some claims to the contrary, this pistol has no significant Western hemisphere military or law enforcement users, but have proven reliable and decently accurate over the many years they've been on the market and have many gun board fans. In a comparison test with the Beretta 92
comparison test with the Beretta 92 it recorded average 3.2" groups at 25 yards - not as good as the Beretta or SIG, but very good for a $350 pistol. It points naturally and if you can find some replacement sights, might do better.