You can delete. Bottom left of post is 3 little gray dots. That's edit/delete. When it asks for a reason just say double post. The mods don't mind doing it for you, but anything they don't have to do is time spent on fixing issues
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As to the question, naturally the 2060 is slightly more powerful of the 2 cards, and does have ray tracing and DLSS, however there's not many games as yet that can take advantage of that tech. However, they are still pretty close. The 1660ti does have a few definite advantages, like the price and power consumption, the 2060 needs a slightly larger 550w psu, the 1660ti is quite happy with a 450w. I would go with the 1660ti personally, but that's me, cheap and can live without the latest and greatest tech.
If you go 1440p, the 2060 will have a slight advantage if you are trying for a 120/144Hz monitor in most games. For a 1440p 60Hz IPS, they'll both get mostly over 60fps on screen, so either is good.
Build looks fine, I'd only make 1 change.
Storage: Crucial - MX500 500 GB M.2-2280 Solid State Drive ($69.95 @ Adorama)
Much better ssd, double the size. Goes head to head with the Samsungs.