What investors would appreciate more about your startup: 1) you have a co-founder who put in some money or 2) you  have an angel investment?

Since the question seems to be related to what to put into a deck, it isn't traditional that I have seen to name angel investors at all in a deck.If he is a founder, i.e., he is putting a founder's level of commitment and time into the company, then name him as a founder. If not, and you want him in your deck, name him as an advisor. And under angel investment just say the total amount raised.If people want the full story, they can ask. And when discussing in detail when the question is asked just be totally honest about how you present him: investors value honesty. They're trying to make a snap decision on whether they feel they can trust you.

It's more powerful when an outsider invest in your startup than when a family member does. If a friend or family member invests in your startup, investors might see this as an act of kindness. For that reason, it's more important to demonstrate that outsiders are willing to invest in your startup without any other affiliation than that of business.

I strongly suggest you read David Rose’s book, Angel Investing: The Gust Guide to Making Money and Having Fun Investing in Startups. It will give you an excellent idea of what to expect in the future. By understanding both the entrepreneur and the investor perspective, you can align both and greatly increase your chance of funding (only about 1 in 40 companies are ever funded).The short answer (but please do read the book) is that you will need personal investment and investment from friends and family before a stranger/angel will invest in your company. My experience is investors do not care much if you have prior investment or not from other angels. The questions will be what was that investment for, and did you meet the objectives for that investment. A strong track record leads to more investment and a poor track record leads to a failed startup.Good luck.