I have AML+AMC+AMR with false9/enganche, if you place them on the wings his playstyle wont activate. so the best false9 is for AMC+ST same as DL+DC+DR with fullback/wingback if you place him as DC his PS wont activate or DL+DC+DR with stopper/ballplayingCB/no nonsenseCB place it as fullback his PS wont activate
well, the fullback is better defensively, they'll follow the winger when opponent attack & usually that winger fails to score/shoot while wingback are better attacking wise.
personally I prefer fullback over wingback but wingback will have higher rating in matches because his attacking contribution makes him get 8-7-9rating in matches compared to fullback who defend properly & get 7-7-7 in matches