I think the real factor is not open space vs private office, but the ideal working environment is a healthy mix of communication (face to face preferably) to ex

I think the real factor is not open space vs private office, but the ideal working environment is a healthy mix of communication (face to face preferably) to exchange ideas/knowledge/status updates and private space for tasks that requires concentration and focus. Clearly the former would be easier in an open space office, and the latter in a dedicated office. And of course, the right mix differs from one person to another depending on the roles and personal characters. In my experience, I think I am most productive in an open space environment with flexible hours / work from home policy. Availability of conference/quiet rooms is another option.