FT8 rather than WSPR?

Although WSPR can detect signals some 10dB weaker than FT8, I am getting better results on 6m FT8 than 10m WSPR.

Maybe the 15 second periods in FT8 are better suited to aircraft reflections. Maybe my 6m antenna is much better than my 10m one. Maybe my 500mW on 10m is not enough?

Certainly FT8 is becoming very popular nowadays. Although I don't know, will this become the new MS mode?