I'm very happy you are not scouting for Everton.I've said on record I have a gut feeling Abraham will flop whereas Dembele will prove the better signing. I'm not suggesting any scientific evidence behind this which is why I made the example that both Van Dijk and Funes Mori were impressive in sub par league's in Scotland and Argentina, both came to the Prem and one has shone and the other not so much.
Koeman had a gut instinct on Van Dijk Roberto on Mori likewise I have a gut instinct on Dembele and yourself Abraham.
The only evidence I could offer is I think physically Dembele looks more suited and has done well in the CL this season against good sides.