Author here. Unfortunately, according to numerous accounts[1], the TB3 to TB2 adapter does not work when you're trying to use an Nvidia eGPU with a Macbook that has an Nvidia dGPU. (Mine has the 750M.) Additionally, the gaming box uses a custom card (so less resale value) and seems to have limited support for other GPUs (thus reducing its use as a general-purpose case).

But yes, for most people, it's almost certainly the better buy. (Though it's still not officially supported, apparently.)

[1]: https://egpu.io/forums/mac-setup/problem-setting-up-aorus-gt...