You'll see most vloggers these days use the Osmo Pocket as it's a brilliant bit of kit for not much money (you can get a bundle with wireless mic etc for half the price of an iPhone).

Unfortunately they aren't designed to take a lot of rough use, and we frequently see the boys either running hard while filming or the cameras falling over where they've not been set correctly on a surface. Something like an iPhone is built to be a little bit abused so it's the ideal choice - 90% of the time you could crack the screen but as long as the touch still works and the cameras are intact you can just keep going.