After watching the 4 minute YouTube compilation, I feel like I know everything there is to know about him and can say that for the money Eze will cost, it's a no brainer going for Doue as as you've said, he fits the winger role better. Apparently he's also comfortable as an attacking mid which ticks that box too.
He looks far more comfortable in a 1v1 situation and running at players which is what I think we all thought Johnson would be like (not writing him off, I reckon he'll get better). We desperately need wingers who can make fullbacks shit themselves, Doue looks like he'd be much better at doing that than Eze.