He's pretty much the only major music reviewer on YouTube. There are other music reviewers on YouTube who talk about specific genres, particularly hip-hop and metal, as well as YouTubers who do more documentary style videos, but if you want reviews of mainstream new album releases, regardless of genre, Fantano's your guy.
Frankly, I don't understand why anyone would watch a Fantano review. In the 80s or 90s people would have to buy magazines to know which albums were worth purchasing, or trade tapes around. Today, if you want to know if you like an album, you just go listen to it on Spotify or YouTube or wherever. You don't need geeks or nerds to help you have an opinion on music. The only reviews I find worthwhile anymore is if the reviewer has some deeper knowledge of the themes or lyrical content of an album and can help guide a listener, but that is not the kind of reviewer Fantano is.