I'd consider the Tanfoglio if I was sure I could get parts if I ever needed them. Aftermarket parts may be hard to find, but companies that support the EAA Witness line might be able to help.
Magazines from a CZ are about the only thing that will work in the gun, and recoil springs. Factory Tanfoglio magazines for the compact models are shorter than a CZ mag -- hold 1 less round, I think -- and won't work in a CZ compact, but CZ compact mags will work in the T-gun but stick out just a bit. Many key parts are slightly different -- although some of the slide stops will interchange with a CZ Compact. Only the very oldest Tanfoglio guns are almost-clones -- and these are NOT that old. Slides won't interchange, you can't us a Kadet Kit, pins have different diameters on most of them. I think the sight dovetails are different.
What I like about the Tanfoglio version is the longer beaver tail, which you now see on some of the newer CZ compact guns. The few "new" Tanfoglio/Witness guns I've owned had pretty good triggers out of the box, and all of them were generally every bit as reliable/robust as a true CZ. I also think the Tanfoglio firing pin block design is slightly less noticeable than the CZ firing pin block.
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