If Rumola still works with Chrome then you can use it with Edge as well since you can install extensions from the Chrome extension store in Edge.

Both Chrome and Edge use chromium as their engine, but I wouldn’t call it “another copy cat” just as I wouldn’t call a new model of a Ford car a copy cat to a new model of a GM or vice versa just because both use an internal combustion engine.

It comes down to personal preference, for example, Edge does have the Read Aloud feature which works very well and which you can sort of do in Chrome but only with one of a number of extensions.