Ordinarily this is where I'd mention who won Best Picture in 1925, but they didn't give out Oscars yet that year so we'll skip straight to my list:
1. KIPHO
Directed by Julius Pinschewer
Yes, I'm rating the advertisement above the agitprop. Purge me if you must.
2. The Battleship Potemkin
Directed by Sergei Eisenstein
Written by Nina Agadzhanova, Nikolai Aseyev, and Sergei Tretyakov
It's really good agitprop, though. And this is the 1905 revolution—the one that my great-grandfather was said to be mixed up in somehow—so it's not like you're cheering for future dictators here.
3. The Freshman
Directed by Fred C. Newmeyer and Sam Taylor
Written by Taylor, John Grey, Tim Whelan, and Ted Wilde
The first great football comedy.
4. Seven Chances
Directed by Buster Keaton
Written by Clyde Bruckman, Jean Havez, and Joseph A. Mitchell
Ever see Cops? Imagine a horde of rocks instead of a horde of police.
5. Variety
Directed by E.A. Dupont
Written by Dupont and Felix Hollaender
Expressionist sleaze.
6. Strike
Directed by Sergei Eisenstein
Written by Eisenstein, Grigori Aleksandrov, Ilya Kravchunovsky, and Valerian Pletnev
The year's other serving of artful Eisenstein agitprop.
7. Jeux des Reflets et de la Vitesse
Directed by Henri Chomette
See Paris by train (may be out of date).
8. The Mystic
Directed by Tod Browning
Written by Browning and Waldemar Young
Long before Freaks, Browning was already the king of carny horror.
9. The Phantom of the Opera
Directed by Rupert Julian
Written by Walter Anthony, Elliott J. Clawson, Bernard McConville, Frank M. McCormack, Tom Reed, Raymond L. Schrock, Jasper Spearing, and Richard Wallace, from a novel by Gaston Leroux
Like that Andrew Lloyd Webber musical, but blessedly free of Andrew Lloyd Webber's music.
10. Go West
Directed by Buster Keaton
Written by Keaton and Lex Neal
Ever see Seven Chances? Imagine a herd of cattle instead of a horde of rocks.
I don't have an honorable mentions list for this year, but I'll give a shoutout to Rebus-Film Nr. 1 just for the sheer strangeness of it. Neither high art nor low art, this is accidental art: It's a crossword puzzle, from the days when some theaters thought it might be fun to project an interactive, visual crossword between the "real" movies. Turns out that when you view it outside of that context, it comes off as an insane avant-garde experiment—much as a regular crossword might if some future archeologist tried to read it as a piece of prose.
Of the films of 1925 that I haven't seen, I'm most interested in The Phantom of the Moulin Rouge.
I haven't watched enough good movies from 1915 to give you a top 10 for that year, so I'll stop this batch of lists here. For the record, my favorite film of 1915 is Les Vampires, or at least its early installments. (I've got nothing against the later chapters; it's just that they came out in 1916.) My favorite of 1905 is El Hotel Electrico. My favorite of 1895 is The Mechanical Butcher. And my favorite movie of 1885 must be L'Homme Machine, by default—it's the only thing I've seen from that year that even arguably qualifies as a movie. It's OK, I guess.