New phone - New SIM or Old

I am getting a new phone. I have an old Galaxy and am getting a new(er) one to use with my pre-paid plan ($30/mo unlimited).

I plan on keeping my old service and phone number.

Should I use my old SIM card or use the new SIM that comes with the new phone?

I don't know if there are any reasons why I should keep my old one (like keeping data) or to use the new one (such as new features or security reasons).