For the SFO - DXB route, which option would be better?
1) EK Premium Economy - non-stop ~ 15h 45m flying time
2) UA / LH Premium Economy - with a stopover in Munich - 16h 25m flying time + 6h connection time. Multiple options with both legs LH or UA + LH.
3) Air France Premium Economy - stopover at CDG - 17h 45m flying time + 2h connection time

This is for work and allows only Premium Economy. I fly mostly J for long-haul personal travel.
I am considering the 2nd option so I don't have to sit such a long EK flight at a stretch. Is EK Premium Economy significantly better?