Currently I am looking at these:
www.cpuid.com/softwares/hwmonitor.html
SpeedFan used to be my go-to tool, but it has not had updates since 2016, and I have seen it crash two Windows 10s during its driver install, though it worked after reboot. It will still give you S.M.A.R.T. hard drive info for any individual drives, and it does this better than anything else I know of.