I don't know how to to answer your question about Manga/western style equivalence, there are dozens of comic art styles, but if anyone's interested to learn more about EU/US comics and Manga outside of those you already know, check out this illustrated compendium which lists several thousand artists: http://www.lambiek.net/artists/index.htm
Regarding European comics, the two most important and influential countries (by far) are France and Belgium.
Some important Franco-Belgian solo artists and teams:
Moebius, Charlier/Giraud (Giraud=Moebius), Hergé, Lewis Trondheim, Schuiten/Peeters, Christin/Mézières, Goscinny/Uderzo, Jean Tabary, Le Tendre/Loisel, E.P. Jacobs, André Franquin, Jijé, Vance/Van Hamme, Francois Boucq, Hermann, Enki Bilal, Jacques De Loustal...to name just a few.
Far less influential than France and Belgium, but still important EU comic countries are Italy, UK, Spain and The Netherlands: Hugo Pratt, Lorenzo Mattotti, Guido Crepax, Liberatore, Milo Manara, Alan Moore, Neil Gaiman, Dave McKean, Don Lawrence, O'Donnell/Holdaway, Alfonso Azpiri, Miguelanxo Prado, Daniel Torres, Henk Kuijpers, Martin Lodewijk, Joost Swarte.
The most important European comic artist of the late 20th century is most probably Moebius (aka Jean Giraud) http://www.lambiek.net/artists/g/giraud.htm He was not only influenced by both, US and Japanese culture, but he also managed to influence both, US and Japanese artists.
For the sake of completeness here are just a few great NA comic artists (outside superhero universes & Disney): Winsor McCay, Milton Caniff, Hal Foster, Will Eisner, Robert Crumb, Charles M. Schulz, Bill Watterson, Chris Ware, Jeff Smith.
