I have a problem with anti-aliasing with two services.
My first service is a esri.layers.ArcGISDynamicMapServiceLayer composed of polygons (no fill color but with an outline-width of 3).
My second service is a esri.layers.ArcGISTiledMapServiceLayer (aerial imagery).
Both services have the anti-aliasing parameters set to "best" and text anti-aliasing set to "force".
When i activated both of them (my aerial imagery is under my polygons), it seems the anti-aliasing is not working well on the polygons and the text. So there always be a small sketchy white line.
But, when I de-activate the aerial pictures, the anti-aliasing is perfect.