when I create a Real server should I create a local UTM network definition or can I create the host definition on the SUM and then select this deployed host when creating the Real server?

We use a SUM and are creating as many network definitions as possible on the SUM and deploying to the UTM arrays.

Now when I create a Real server should I create a local UTM network definition or can I create the host definition on the SUM and then select this deployed host when creating the Real server? 

The only difference that I can see is that when you create the host definition on the UTM you have the additional interface field which isn't present when you deploy the host definition from the SUM however if I'm following advice which seems to be to leave interface set to Any then does this matter?

thanks

Mark