Best of Both (or just BoB) is a site that integrates YouTube streams with Twitch chat, for any Riot Live Stream. This is specially useful for user with slow internet connection that for some reason enjoy Twitch chat. Thanks to YouTube auto-quality feature, the stream will adapt by itself to the necessary quality to avoid pausing and buffering, and the resume time is also faster than that on twitch.
BoB has an evil twin called BoB Replays, where users can vote for their favorite match from LoL eSports Youtube Channel and watch it together, it's also integrated with Twitch chat
You can follow BoB on Twitter for any update about the site @BoBStreams
Or Reddit /r/bestofboth