One of the videos I saw on the matter stated that RAW was easier to edit than the H.265 which requires one to transcode in your computer or use an external recorder to record into a more edit ready codec like ProRES or Avid DNxHR for example. This isn't exclusive to Canon really so I wouldn't make a determination on a purchase based solely on this. The H.265 of most cameras is "rough" on most computers but having hardware acceleration/transcoding helps to alleviate some of the issues. If using H.264 (or a variant) most computers have little issues without the need to transcode but most 10-bit file types are using H.265 compression for more manageable file sizes. How much this matters is subjective but typically I'd say if you have an older computer that struggles, either use an external recorder to save time transcoding after the fact, shoot 8-bit/H.264 for non-critical work, or maybe try to find some files to download prior to purchase to see what's the most efficient workflow for you.
Personally, I got a Atomos Ninja V last month while they were running their $200+ off sale with the Battery Power kit, a 1TB WD Blue SSD, and the Master Caddy 5-pack for ~$750. I also got an additional three SanDisk Ultra 3D NAND SSD's and a Samsung EVO 860... all 1TB varieties while several outlets were having data storage sales around late June to early July. This has sped up my video workflow vastly.