Currently Dev and Canary are both on the same build, 26058. They only differ in their minor build number, but there is no actual difference in the OS itself. Canary is .1000 and Dev is .1100. This is not going to last, Canary will soon go on to a higher (and more experimental) build, while Dev will remain more stable and heading towards what may turn out to be the 24H2 release build. You have a limited time in which you can choose which channel to go with, Dev or Canary.
If like me you are not an Insider, you can use this script to choose which channel's updates you want to receive going forwards. For getting to know what's in store for 24H2 I'd recommend Dev.
OfflineInsiderEnroll - A script to enable access to the Windows Insider Program on machines not signed in with Microsoft Account - abbodi1406/offlineinsiderenroll
github.com