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To sum up really quickly the difference between the DJI 04 Air Unit (Lite), and the DJI 04 Air Unit Pro systems, the Lite is a little more than half the price of the Pro system at around $99 US versus $229 US so it does not have all the features or quality of the Pro, but the Lite version does offer a supper compact size perfect for smaller drones which is exactly what I am into.
I have 4 drones that had older DJI Vista Air Units in them, which allowed me the ability to use my DJI Goggles 2 Integras to view camera video in digital 720p which is leaps and bounds over what an analog VTX system looks like. The Vista system "cased" and "de-cased" fits in smaller FPV drones very well and overall I was happy with this setup. That is until DJI came out with the DJI 04 Air Units.
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One of my biggest problems is that I had to keep my DJI Goggle 2 Integras in order to use my DJI Vista VTX and cameras. I was not able to use my newer DJI Goggle 3's, so I had to have two sets of rather expensive Goggles on hand to fly all my FPV drones. The logical solution was and is to swap out the Vista setup with the newer DJI 04 Air Units and get rid of my Goggles 2 Integras completely. The sale of my Goggles 2 Integras at around $350 along with the selling of my older DJI Vista Air Units will more than offset the price I pay for the newer DJI 04 Air Units, and I will get a significant upgrade in video quality in not only my Goggles but also the ability to record 4k 60 frame per second video on board the DJI 04 Air Units VTX.
There is one problem with all of this... The DJI 04 Air Unit Lite system has a bit of a flaw in that when you try and use stabilization to the record video, it actually makes the vide worse. I have a few ideas about this I talk about in this video and I am hoping that DJI will implement a firmware update soon and or that the addition of a proper camera mount that insulates the camera from the vibrations of the FPV drone will fix this problem...