My take on NVDIMM for home devices (which in my lexicon means <dozen small-scale servers, not those of you with a microgoogle in your cellars
) is that generally you'd likely want to populate the memory slots with memory before using something like an NVDIMM, whereas PCIe lanes for NVME devices are already commonplace and only likely to get more so as time goes on. As Patrick mentions, hardware and OS support for NVDIMM is still in the teething stages.
If we're talking SLOG and a single optane device tops out at 800MB/s for sync writes then TTBOMK you could just add another SLOG device and ZFS would use both devices (effectively "striped" in non-technical terms) and you'd then get at least 1.5GB/s sync write performance (haven't tested this myself or read up closely on it so please do correct me if I'm wrong).
That said I have difficulty imagining a workload at home that'd require sustained IO performance at north of 1GB/s and especially not 4GB/s, but like I say I'm small scale - my only optane device currently in use is a comparatively titchy 64GB M10. My £0.02, YYMV, warranty void in the event of me not being a wizard, etc.