EFD Software's HD Tune is described on the company's web site as such: "HD Tune is a hard disk utility with many functions. It can be used to measure the drive's performance, scan for errors, check the health status (S.M.A.R.T.), securely erase all data and much more." The latest version of the benchmark added temperature statistics and improved support for SSDs, among a few other updates and fixes.
Read performance was slightly more competitive in HD Tune, though the Samsung Portable SSD T1 still enjoyed a comfortable lead. Write performance wasn't even close.
What you don't see here is the same consistent performance throughout the duration of the benchmark that we saw in ATTO. The T1 isn't prone wild and seemingly random (and certainly annoying) spikes when pushing or pulling files.