This is definitely NOT a very controlled test!
On 6m, my usual power is 3W FT8. On 10m I usually run 200mW of WSPR. WSPR takes almost 2 minutes to TX a message, whereas FT8 takes about 15 seconds. WSPR is able to use far weaker S/N ratios. WSPR can detect down to about -32dB S/N. FT8 can detect down to about -23dB S/N.
Even though I am using different powers, different bands and different antennas, the impression is FT8 is more often used and achieves better results than WSPR with Es. Maybe shorter TX times help when conditions are more up and down? I certainly get far more spots with my 3W 6m FT8 than my 10m 200mW WSPR.
I would be interested to know if anyone has done a proper, scientific comparison.
What is not in doubt is that both modes are superior to SSB and CW. Things may be different when the path is stable, such as with scatter, tropo or F2.
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