Here's a rare cheat sheet on channel reporters, specifically those who cover cloud and SaaS. Other than CRN's, the audiences are small. Niche is perhaps a better word.
Looking for high-visibility distribution in the channel? Informa's Channel Partners is offering a fun way to get it. As part of September's Channel Partners Evolution 2019 -- a F2F event in Washington D.C. -- Channel Partners is hosting the Channel Futures Shark Stage, on which your client can plead its case to a panel of no-nonsense channel executives.