It depends on how arrangement is done, because there are different types in various cultures.
But if this is done in correct way – I think arranged marriages should be more successful in 25%.
Similar as with Emotional Buying in marketing: if buyer comes to the shop without clear idea what he wants – he buys 25% unnecessary things only emotionally.
It means that caught by emotion and passion part of relationship should be accidentally made with incompatible persons.
That’s exactly what arranged marriage tries to prevent.