You also do not get to completely decide what you get and spend hundreds to thousands for puget to build and warranty it as a service fee.
Very true, but the OP's initial posting said they "wanted to buy a new 3D PC", as opposed to "wanted to build a new 3D PC" which I took to mean they were considering a prebuilt.
Like many people on this forum, I've been building computers for decades, but others who may have no practical experience whatsoever, prefer to let someone else create a bespoke system designed for their particular application(s).
I use Puget simply as a guide for the best mix of parts for specific programs.
It's interesting that Puget's default Maya system (which is somewhat outdated with a 13900) starts off with an RTX 4070 12GB. A far cry from an RTX 4090 24GB.
Puget's standard workstation for Houdini starts with an even lower spec RTX 4060 Ti 8GB and a 9900X for $4,462. Their professional Houdini workstation has a ThreadRipper Pro 7965WX, but still uses nothing more fancy than a upper mid-range RTX 4080 Super 16GB, for $10,981. Puget seem to be concentrating on ThreadRipper grunt for Houdini, not GPU power.
The system requirements for Houdini 19.0 are modest, when compared with other programs, e.g. 4GB system RAM minimum, 12GB RAM or higher recommended, 64GB for fluid simulations.
https://www.sidefx.com/Support/system-requirements/19.0/
From these default Puget builds, it looks as if Maya and Houdini do not make such intensive use of GPU OpenCL/GL as programs such as Adobe Premiere Pro. That's why I said concentrate on your most important app when choosing hardware.
If the OP runs other applications that require a lot more GPU power, then an RTX 4090 24GB would be a better choice. Puget even offer the RTX 6000 Ada 64GB as an expensive upgrade on some systems. I haven't looked at Unreal Engine, Vray or World Creator's requirements.
With a wide range of apps, an equal mix of CPU and GPU processing power would be an excellent compromise, but for Maya and Houdini, a really powerful GPU might be overkill.