Well, The A320 does have a less cramped cockpit, but I guess that dosen't have anything to do with preformance/profits. The A320 has a lot more range than the 737. It, however does depend on what 737 variant your talking about. If your talking about the 100/200/300/400 or 500 then the A320 would be 100% more profitable but if your talking about the 737NG's then it would be close.