While in the real world I think the two guys are very similar, in fantasy, I have to think Young is the better option. The RBIs Edgar will get in Boston will equalize the rankingsto some degree, imo, but I don't think he'll hit for as much power.
My statlines for each this year:
Some people will also disagree with me, but I think that Edgar will be hitting in the 6 hole in Boston, as the Sox management team loves Bellhorn in the 2 hole, with his .370 obp
Otherwise, very close