Which side wins this fantasy football trade: Diontae Johnson or David Montgomery?

Question context

My team at WR currently consists of Justin Jefferson, DK Metcalf, Ja'Marr Chase, Diontae Johnson, and Rashod Bateman. My league requires two flex players (W/R/T), and they have typically been Diontae Johnson and Ja'Marr Chase. At RB, after losing Christian McCaffery for the season, I only have Cordarelle Patterson, Matt Breida, and Ty Johnson. Potential players I could use to replace Diontae Johnson at Flex, should I accept the trade, would be mainly Breida, Goedert, or Bateman, likely depending on their matchups, but there are some possible waiver wire guys out there I'll likely pick up (Russell Gage, Tevin Coleman, Cole Kmet, Boston Scott, DeSean Jackson, Josh Reynolds). The team offering to trade Montgomery to me for Diontae Johnson currently has Josh Jacobs, Myles Gaskin, and Ezekiel Elliot as his other RBs, and his current WRs are Brandin Cooks, DeVonta Smith, Marquez Callaway, and Deonte Harris.

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