Is it more secure to have a random outbound port number or an assigned one?

I have been doing some research regarding DNS servers and had a question regarding port numbers. I noticed that when configuring a DNS server you can choose to have the outbound port number either be a random open port port or have it come out an assigned port. Which one would be a more secure route? I had heard that the more open ports are available the less secure a system can be.

submitted by CheshireCrab
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