I was thinking along similar lines. RBs are comparatively "less expensive" than WRs, and theoretically easier to find...especially if you can conjure up a RB by committee. In fact, I PREFER that approach over a workhorse/bellcow back that, if injured, tanks your run game. But with that said, both rooms are somewhat injury prone and thin.
So how to decide? Can we get a RB in the 2nd or 3rd that is an improvement over Miller, CEH, or Mims? Can we get a WR in the 2nd or 3rd that is an improvement over Olave or Shaheed? If the answer to either question is yes, then go with the other position. If the answer to BOTH questions is yes, pick the BPA at #9 and pick the other position in a later round when the value lines up with the need. But with all that said, Saints need an upgrade at a few starter positions; and an upgrade of depth all across the board. Other than QB, this draft class is supposed to align with Saints needs and is also deep. If that's true, IMO, this draft should be BPA every step of the way and let the chips fall where they may. Maybe we can start "targeting" wants next draft? But this draft, we have too many "needs" and "musts" to be targeting "wants". JMO.