Combine all nodes of two content types as table rows / columns
its very easy if contentypes are "entity reference" related, on "less important" contentype add an entityreference field and relate that node to "main contentype", in views add a relationship with your entityreference field, filter (not exposed) to display only "main contentype", and when adding fields to your view (now both contentypes fields are listed in drop menu field listings), specify if you use or not the relationship, for fields on "main contentype" do not use relationship, do it in all "less important contentype" fields. done.