The difference is that the blame is shown all the time. magit’s blame has to be activated (magit-blame) and the buffer is read-only in the Magit-Blame minor mod

The difference is that the blame is shown all the time. magit’s blame has to be activated (magit-blame) and the buffer is read-only in the Magit-Blame minor mode. Personally I find the feature distracting and turn it off (gitlens.currentLine.enabled set to false). Of course, GitLens also has a separate blame mode.