Quality of Jcrew/wallace and barnes pieces varies from piece to piece just like RRL. Sometimes quality of the WB material is outstanding. In terms of styling and finish I prefer RRL. I have/had a couple of the Jcrew chambrays and they were ok but I dont particularly look forward to wearing them. Its a bit of a crapshoot so you have to try it out.
The nicest chambray shirt I have is one made by Haversack.