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Thanks a lot for the answer SMG. I really appreciate it. The one thing that is special about our case is that we actually only need organic traffic on the individual apps not on the root domain. Therefore we mostly care about the strength of the individual apps. I simply assume that a lot of people will link the landing page (rootdomain.com). So, with a subfolder system I hope to get more juice from the root domain to the apps and also that app1 for example can better support app2 with a better distribution of the root domain strength. Well, I guess there might be no other way than to try it. If anyone else has another opinion I would love to hear it before I make the changes tomorrow.