Unless if you plan on exploiting DLSS or the ray-tracing capabilities of the GeForce RTX 2060, then there's little reason to own an RTX 2060 laptop over a GTX 1660 Ti laptop especially from a performance-per-dollar perspective. The gain in raw graphics potential is minor at under 10 percent compared to the larger price markup.
https://www.notebookcheck.net/GeForce-RTX-2060-is-only-5-to-10-percent-faster-than-the-GTX-1660-Ti-on-laptops.428482.0.html
Important thing to know...1660 to has a lower power version. 2060 doesn't.