Since I was the one who, a while back posted about Venmo as a possible way of divvying up the check at dinners, I feel obliged to pass along the reason why I will likely delete the app without ever having used it.
First I saw a posting about how several videographers in the LA area have had tens of thousands of dollars worth of video equipment stolen by a ring using Venmo. The tl;dr is that they exploit the fine print and end up getting the victim's account shut down as well as taking the gear.
Meanwhile, PayPal remains safe, or at least has anti-fraud mechanisms.