External 2.5" HDDs connected via USB for longer term bulk storage and using it as a NAS, a smaller internal NVME SSD for the OS and a larger one (but SATA, so slower) for the directory were torrents go to.

The different drive performances fit my usage pattern just fine whilst optimizing price per GB.

External 3.5" would be cheaper for bulk storage but the 2.5" are a leftover from when I was more space constrained.