Ecuador is in the odd position of having 3 major field guide offerings but none that is clearly the best option. Juan Freile's new guide (published by Helm with Restall art from Birds of Northern South America) has the most up to date range and taxonomy information but is hindered by the art quality. I personally prefer Miles McMullan's Fieldguide - it is far more compact, has useful if concise text, is up to date, and I find the art at least as good and frequently much better than Restall's art. Either one is perfectly serviceable if you already know your way around S American birds but if you're just starting, the older Ridgely guide might be a better resource for learning neotropical families and genera, and it contains much more thorough text. I have Ridgely and McMullan and just don't see any use for Freile, unfortunately.
I also agree that the Peru guide has far better art and is a great resource. AFAIK, the app is still only available on iPhone and not Android, but is a great app and I would argue pretty indispensable for S America. There should be a new Hilty guide to Colombia with Lynx/Birdlife art this year (scheduled for "early 2021" per Lynx) - this promises to be a very valuable addition not just for Colombia but for all of northern S America.
In my personal view, it's a great shame that the new Helm guides for Ecuador, Venezuela, and Trinidad & Tobago used Restall art instead of Lynx or otherwise sourced original art.