I know this is the Bradis sub-forum... And I cannot and will not speak for them.
However, in MY limited experience with a formerly owned Waffen Werks AKm-74: The quality, fit, & finish were quite nice. I've never owned either of the two other brands you've mentioned, but I've handled plenty of WASR rifles built by CAI.
The WW rifle is a definite step up from a WASR.
Most folks still consider the Arsenal rifles to be the best of the best - but I think WW has closed the gap.