Saddle choice for long distance rides
Get your sit bones measured.  

Bikes are made in different sizes, handlebars in different widths, cranks and stems in different lengths, seat tubes are adjustable.  Why all this variation?  Because people are built differently.  So why just choose a saddle that "should be good" and go?  Get your sit bones measured, then buy a saddle from a company that makes different width saddles to accommodate different riders anatomy accordingly.