Hello ,
Thank you for contacting us and posting in the community your questions.
The main difference when using and RTX GPU versus a Mac M1 is that the Path Tracer won't be available for Macs and VR will not work on Mac without special setups. We also have not yet made Twinmotion or the Datasmith Exporter plugins compatible with M1. We are working on making M1 compatible so you can use the software without any issues and should be coming later in the year.
In order to best understand the reason why Path Tracer is not available for Mac please refer to this article:
https://twinmotionhelp.epicgames.com/s/article/Path-Tracer-Requirements
The export process for the default Raster Engine should be identical for both Mac and PC and any compatible video card. I am not familiar with all the benchmarks comparing PC and Mac export times but the quality output should be the same. Here are the full system requirements for reference: https://twinmotionhelp.epicgames.com/s/article/TwinMotion-System-Requirements
The Path Tracer is a rendering process that gives much better shadows and reflections making the images more realistic. It also is much slower than the Raster Engine and requires more patience when making animation since the export times will be much longer. Thus it's not a true Real-Time rendering engine and not available for VR mode. It is good for exporting at higher quality but with a significant speed impact to consider. Here is a link to the overview video: https://youtu.be/XlFQ2HbiGvY
You can look in the Facebook community for further examples of Path Tracer from other users: https://www.facebook.com/groups/twinmotion.community/
Here is a link to a video showing recent renderings with Raster and Path Tracer results:
https://www.youtube.com/watch?v=29PpkSAIY4E
If you plan to use Twinmotion and Unreal Engine we have a TM to UE plugin and you can use the Datasmith Exporter plugin from Archicad to import into Twinmotion or Unreal Engine.
There are some online companies that offer a way to rent hardware, so you can run Twinmotion on it and use Path Tracer for exporting those necessary medias. There could be others but this is one that some Twinmotion users have mentioned they were using. LINK
Hope this helps and let me know if you have any follow-up questions.
Kind regards,
Vincent B.