SwiftData Master Details

I want to create master details relationship between patient and vitals signs so which of option codes below are better performance wise ? Option one is master - details done manually ..

option 1

@Model
class TestResult {
    @Attribute(.primaryKey) var id: UUID
    var patientID: UUID

Option 2

@Model
final class Vital {
    var patient: Patient?
SwiftData Master Details
 
 
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