I’m obsessed with just saving the best for last hahaha!!!
Whichever provides for the greatest dramatic irony.
I do the same usually but it depends on who I am sharing that information with and how I get along with that person and how close we are. Some friends I just share only the good news if there is any because they honestly could care less about anything that really matters in my life and don't have time to hear anything else. Others I do open up to with good and bad because they give me input and feedback which is nice.
Usually the good news first. That way if they need my assistance I can focus on that. With some people it gives me time to savor the moment. I'm working on the second part.
I figure the bad news is usually going to dominate the news share, so I typically tell the good news first. Saving the good news for last rarely softens the bad news, but usually diminishes the impact of the good news. I figure the good news should go first so the receiver of the news can enjoy it before the bad news comes to light.
I allow the recipient to exercise "free will" and choose which one to hear first.