Stefon Diggs is the way to go, according to the computer. He is ranked 16th overall and is projected to put up 302.2 fantasy points this year.

diggs or thielen
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NAMETIMEFRAMEFANTASY POINTSRANKPASS YDSPASS TDRUSH YDSRUSH TDRECREC YDSREC TDOTHER TD
Stefon DiggsStefon Diggs2021 (Projected)302.2WR30.00.010.80.0109.51,395.48.70.0
Adam ThielenAdam Thielen2021 (Projected)242.0WR160.00.028.40.280.31,034.79.00.0
Fantasy projection data is provided by ESPN.