I would prefer a Studio if it does a decent enough job even if throttles a bit under load, way less power usage and noise than those GPUs plus the PC you need to put those in.
If you're fine overpaying for a throttling computer, you could buy 40-series cards and underclock them to the same TDP of a Mac Studio.
You'd probably get faster prefill speeds, as well as better drivers for accelerated transcode and gaming applications.
Yeah but you could heat your whole house!