Tamron 18 200mm f 3 5 6 3 vs sigma 18 300mm f 3 5 6 3?

Here is what the site says about that.

From Tamron 18-200mm f/3.5-6.3 Di II VC: Tamron 18-200mm f/3.5-6.3 Di II VC: A zoom lens by Tamron for APS-C cameras, 18-200mm f/3.5-6.3.

From Tamron 18-200mm f/3.5-6.3 Di III VC: Tamron 18-200mm f/3.5-6.3 Di III VC: A zoom lens by Tamron for APS-C cameras, 18-200mm f/3.5-6.3. An older compact APS-C travel zoom, now discontinued.

Quoted from this site's pages.