Total training time in WSL is ≈34% slower than in pure Ubuntu with the dataset in the same virtual hard disk.
Here is a screenshot of the GPU usage when running the training code on the Arc card in WSL.
There is an additional ≈20% increase in training time when using a dataset on a drive other than the virtual hard disk that stores the WSL-Ubuntu install.
That, plus the hassle of setting permissions for folders outside the virtual hard drive, means you should probably only do that if your C drive has limited space.