I would take Richardson. STL is going to be spreading the offense out this year, yes it's non ppr but he will get you solid points from rec yards. Pead and Stacy have looked horrendous so far this preseason. Richardson will be the workhorse this year as long as he is healthy. Over the next three years I would rather have Richardson than Mendenhall.
I drink because of the 1998 NFC championship game.
12 team big $$$ non PPR league - QB RB RB WR WR TE D K
RB: Murray, Matthews, R.Bush, D. Brown
WR: Julio Jones, Colston, VJax, Garcon
TE: Witten, Gresham