SUSU diapers are ok . But we don’t know how these diapers are made and what quality of materials they are using.
I used just one pack for my daughter then switched to Pampers. We wanted to stick to a known brand . Huggies is also good but Pampers is more easily available in Pakistan.
Regarding diaper rash , some babies are allergic to different type of fabrics / diapers. I know one of my colleague was only able to use a single brand of diaper on her daughter. I suggest you consult a doctor. I used to apply johnson & johnson’s petroleum jelly it’s safe & affective.