I want to investigate global self-esteem and contingent self-esteem in a mediation model by using Process. I am however in doubt about which model I should choose. Research shows that global self-esteem and contingent self-esteem are moderatly and negatively correlated, but no causal relationship between these two variables has been determined, Although, research does indicate that people with low self-esteem are more likely to have contingent self-esteem as well. Should I use the parallel mediation model here?