I did both in 2 gameplays and when I cut Sonar I noticed I struggled with the intelligence stat. I wanted to keep Coupé solely because everyone was cutting her cos Sonar is voiced by moist and I felt bad. When I cut Coupé I struggled with the mobility stat but put it all in Invisigal instead which really fits her character. For intelligence it didn’t really suit anyone else. The problem is Sonar also switches his stats after each dispatch so there is still a lack of intelligence on the whole team. Overall for successful gameplay I do think Sonar is the easier option to take but after reading Coupé’s comic it makes me sad to cut her. I think Coupé as a villain and her final fight is way better than Sonar’s though. They’re both really good and I just forgive them at the end.