Pros/Cons of partnerships?

[David Sanford]

A friend of mine wants to start partnering on rentals. 50/50 split. Whats the advantages and disadvantages of this? If I can buy 5 rentals on my own at $400 profit each, or 10 together at $200 profit each after split, I don't see the point in partnering if the income will be the same either way. Am I missing something? side note: I currently have been investing for about 2.5 years and have 6 rentals on my own.