Is a seperate or combined prop and rudder assembly better for a wooden rigger build

[lilbigmacky]

I am currently building a wooden rigger boat that will be about 650mm long and am choosing running gear to put on it. I was wondering if it would be better to have the prop and rudder separate or on the same assembly. any advice greatly appreciated.
HTB1qrnFXoY1gK0jSZFCq6AwqXXay.jpg (combined prop and rudder assembly)
prop.JPG (standalone prop assembly)

[NativePaul]

Separate.