WiDi stands for Wireless Display and WiFi stands for Wireless Fidelity. WiDi is the technology developed by Intel. The feature is built into many of the intel products such as laptops, tablets etc. This technology helps user to connect their PC or any other computing devices such as laptop, tablet with HDTV. Mac Airplay: Streaming Videos and Music from your Mac to your TV. On most Macs with at least an Intel Core 2 Duo platform ( 2011 models).

If one were to choose between one of the MacBook Air's / 13' MacBook Pro (regular or retina display) or some (comparable) Windows notebooks can anybody speak from experience (or seen results) to fill my curiosity of which is better for wireless mirroring on a HDTV? Say both run on the same router (mine is a WRT610N if we want to be specific).
A $700 notebook (with a subpar WiFi card) even supports Intel WiDi so yes I'd imagine that device to maybe do 720p mirroring instead of the 1080p capability of Intel WiDi but I think from a Mac notebook AirPlay anyway only supports 720p. In that case it's almost certain Intel WiDi (from a $1000+ notebook) > Apple AirPlay. Maybe somebody who uses WiDi could chime in?
I have a pretty deep Apple ecosystem so it's not so much about a purchasing decision as much as trying to understand how good Intel WiDi (with Apple AirPlay as a benchmark) is, as somebody in the house just got a HP Envy dv4 Ultrabook that supports Intel WiDi.
I think the Apple TV is more functional (especially if mainly an Apple ecosystem) because you could install AirParrot for the PCs in the house to enable AirPlay mirroring from a non-Mac machine, but Intel WiDi I don't think has any Mac-support, does it?

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Apple is rumored to be working on a refreshed version of the 13-inch MacBook Pro following the launch of the new 16-inch ‌MacBook Pro‌ in October, and the new 13-inch machines could adopt Intel's 10th-generation Ice Lake chips.
Over the weekend, a Twitter leaker shared a 3D Mark Time Spy benchmark of a machine said to be an upcoming 13-inch ‌MacBook Pro‌ equipped with Intel's 10th-generation i7-1068NG7 Ice Lake 2.3GHz chip with 4.1GHz turbo boost capabilities (via Wccftech).

2020 13' Macbook Pro
> i7-1068NG7 2.3GHz base 4.1GHz boost 28W
> 32GB of RAM
> 2TB SSD pic.twitter.com/o4k6ymc6oJ

— _rogame (@_rogame) February 15, 2020
The benchmarks compare the new 10th-generation chip to the 8th-generation 2.4GHz Core i5 chip in the high-end 13-inch ‌MacBook Pro‌ from 2019 and suggest the new 13-inch machine Pro will be approximately 12 percent faster than the current 13-inch ‌MacBook Pro‌ when it comes to CPU speeds, and close to 30 percent faster when it comes to GPU performance.

Time Spy
i5-8279U 4C/8T 2.4GHz base 4.1GHz boost + Iris Plus 655 with 128MB eDRAM 28W (2019 13' ‌MacBook Pro‌)
vs
i7-1068NG7 4C/8T 2.3GHz base 4.1GHz boost 28W (2020 13' ‌MacBook Pro‌) pic.twitter.com/Ogr4sfGGNa

— _rogame (@_rogame) February 15, 2020
If Apple does release a 13-inch ‌MacBook Pro‌ with the aforementioned Ice Lake chip, it will be the first Apple notebook equipped with a 10th-generation chip. Though not included in the leak, a 16-inch ‌MacBook Pro‌ refresh in 2020 could also feature 10th-generation chips, though 16-inch machines are expected to use Comet Lake chips built on the 14++nm architecture as there are no 10-nanometer Ice Lake chips appropriate for them.
Rumors suggest Apple will release an updated 13-inch ‌MacBook Pro‌ in the first half of 2020, perhaps at its March event, though WWDC is also a possibility. Along with 10th-generation Intel chips, the new machines are expected to feature the improved scissor keyboard that was first introduced in the 16-inch ‌MacBook Pro‌, along with the option to upgrade to 32GB RAM.