Of those mentioned, I'm subbed to Happy Console Gamer, Metal Jesus, Game Sack, Gaming Historian, Pat (for their podcast topics, mainly), LGR, and AVGN; Happy Console Gamer, Game Sack, Gaming Historian, and LGR are my favorites of the 10 ranked channels. Super Bunnyhop (honorable mention on the video) doesn't really count as a retro gaming channel as he mainly talks modern video games; awesome channel, though. AVGN is enjoyable, but has declined over the years, same with Classic Game Room; that said, I feel they still belong on the list.
I would have included Spida1a, Derek Anderson (Happy Video Game Nerd), Retro Core, Kim Justice, and Lukemorse1. I probably would also include John's Arcade as he specializes in arcade hardware, even if he gives off an annoying Adam Richman-vibe.
I feel Twitch >>> YouTube in terms of gaming content, especially given all the copyright BS YouTube has; my subbed Twitch channels are Dead_Flip (pinball), The Mexcian Runner (NES speedrunner and a Chrontendo-like series, NESMania), LordBBH (MAME streamer), Macaw (streamer of obscure games and consoles) and soon-to-be Puri_Puri (Playstation, Saturn, and Dreamcast streamer).