Vieira is obviously superior. But in order to get him I'd have to change Neymar to the 94 version. Is it worth it? I don't see much difference between the two Neymar's. Neymar would be playing CCAM in a 4231.
This is my team now. Haven't played Sissoko yet, gonna try him out. Otherwise I'd put POTM Goretzka back as the other CDM.