The GTX 1660 Ti Mobile is actually the more powerful card than the 2060 Max-Q due to the frequency.
The key advantages to the 2060 Max-Q in terms of performance are, first, its ray-tracing capability, but that's sort of a paper advantage even at 1080p due to the fact it isn't strong enough to run most ray-tracing capable titles once more meaningful rasterization-dependent effects have been maximized in settings.
Second is that DLSS capability. That's probably more meaningful, but it still isn't meaningful. It's only worth turning on if DLSS 2.0+ are supported, and while DLSS 2.0 launched on March 26, 2020, as of today, there is just 28 total games supported, and that's where it is projected to finish for its first year. That means they're adding roughly 1 game every two weeks. For context, Steam added 10,263 games in 2020. So DLSS is covering 0.27% of Steam's releases, and of course even among major releases that doesn't cover the Epic and Microsoft exclusives that aren't on Steam.
Otherwise, more meaningfully, the difference will be heat, noise, and most of all, battery life. The Strix will have to run its fans more loudly to keep that 1660 Ti cool, and even with that, it will be much hotter if you put it on your lap, for instance. The heat may cause stress within the tight confines of a laptop that can't separate & insulate more heat-sensitive components as easily. It will also sap more juice to sustain that higher frequency. Even in a blind I fairly confident in guessing it isn't as light or thin a laptop.
That's despite that the Zephyrus capitalizes on the reserve energy saved for the more aggressive 35W Ryzen CPU, and that's what makes all of the above moot. There is no i7-10500, so I'm pretty sure you mean the i7-10510U. The Ryzen 4900HS utterly destroys that CPU. Crushes it. Raids its village and plunders its women.
Ridiculously easy choice given the modest price difference. Get the Zephyrus.