Well, it kinda depends on what the video is for. If you're going to be using some type of compression for video, then 60 could work, since video is actually 2 frames for every one frame of video (since two frames are interlaced into one frame, don't ask me why), so having twice as many frames would simulate real video. Although, to be honest, it's not really a noticable difference between 30 and 60. Actually, with video, it's not 30 frames per second, it's 29.997, but that's kinda too small to care about, if you ask me, and I don't think anyone has every really cared. And if it's for the internet, I don't think people would like you if they had to download 60 frames for every 1 second of video. We would stone you repeatedly with small pebbles. If you wish for it too look like a movie though, you should just render it at 24 frames per second, the industry standard. So generally, I stay at 30.