Roku Streaming Stick vs. Chromecast: Which dongle should dangle from your TV?

Last fall, Google released the first pint-sized streaming device: the $35 Chromecast. The $50 Roku Streaming Stick soon followed. They look like flash drives, both plug directly into an HDMI port, and both are reasonably priced. You can access a huge selection of online streaming services with either device, which you can control via