A financial system which is better suited to growth might be less suited to risk insurance, for example. Therefore, specific positive characteristics of one system should not be transferred blindly to another. As a consequence, it is hardly surprising that there is no clear-cut answer.
One critical lesson is, that at the time, the EU and the monetary union did not have proper tools to deal with such situations. Those tools needed to be created, and they were. The euro area countries in biggest problems received financial support conditional on stabilisation programs. Setting them up took a fair amount of time and effort.