Trade advice Miller for Ertz?

12 team .5 ppr 2 rbs and a flex im stacked at WR and sort of at RB, i was offered ertz for my lamar miller. heres my rb situation (hoping i get yeldon to handcuff fournette) bell, conner, fournette, miller, ingram, barber (hopefully yeldon instead). my tight end is jack doyle who i think is going to have a decent year but ertz will ball with wentz out there. do i take it?