Final Cut Pro X to After Effects Workflow Everybody is saying FinalCutPro to Motion5 is like PremierePro to AfterEffects. But its a fact that AfterEffects is more powerful than Motion5. So since I love the simplicity of FinalCutProX as my Cutter, for me the perfect solution would be using FinalCutProX together with AfterEffects. 

Now does that make sense or would you better not do it like this?
If yes, how is your workflow to not loosing any quality of the clip by exporting to AfterEffects, editing there and exporting back to FinalCutProX?
It is certainly possible to use FCPX and AfterEffects as part of the same workflow.  To do this effectively, you will need to use an intermediate codec that preserves image quality across successive generations.  ProRes HQ 422 is a good baseline as an intermediate codec.  There are higher quality ProRes codecs (XQ 4444) and lower quality ones (ProRes LT 422).  But ProRes HQ should be a good starting place.