Honorable mentions ... many of these might have made the list if I'd compiled it on a different day.
Halloween and Halloween 3 (the latter is very underrated because it should have been a separate movie from the Myers franchise, but it's still a crazy and very original horror flick)
Carrie
Psycho 2 (in hindsight this would be in my top 15, but I'd forgot it while compiling)
Evil Dead 2 (just for the fun of it)
Night of the Demon
The Wailing (yes, another modern horror)
The Brood
Cat's Eye
Scanners
Texas Chainsaw Massacre
Devil Rides Out
Event Horizon
Blair Witch Project
Exorcist 2 & 3 (yes I like both of them)
Exorcism of Emily Rose (too many court scenes, but the horror stuff is very good)
Day of the Dead
Ghost Story
Babadook
The Grudge (Jap version)
The Eye

Jacob's Ladder was a great horror/thriller film.  The demonic portrayals were both original and bone chilling plus Tim Robbin's performance was fantastic

Don't forget Ghostbusters 2016. Truely horrific.

I was moving the cursor over the timer to get that quick preview of each movie title, and the section where Ager talks about The Twilight Zone movie, only the word "Twilight" came up over the timer bar.  For the briefest moment, I was admittedly puzzled, thinking there's no possible way Twilight would've made a "best of" list by Ager.

The Exorcist III is criminally underrated, and one of my favorites.

One film I don't want to disappear into film history is The Hitcher.  The entire film is just so surreal, and Rutger Hauer's character has an almost otherworldly presence, as if he just stepped out of the landscape of the American roadways.  Superb film IMO.

The Exorcist III is my favorite. The dialogue in this movie is just amazing.

25- Videodrome (1983)
24- The Incredible Shrinking Man (1957)
23- The Legend of Hell House (1973)
22- Audition (1999)
21- Salem's Lot (1979)
20- Murder by Decree (1979)
19- Night of the Living Dead (1968)
18- Amityville II: The Possession (1982)
17- Rosemary's Baby (1968)
16- Fright Night (1985)
15- Invasion of the Body Snatchers (1978)
14- The Fly (1986)
13- The Twilight Zone (1983)
12- Creepshow (1982)
11- Hellraiser (1987)
10- The Exorcist (1973)
9- Psycho (1960)
8- An American Werewolf in London (1981)
7- Silence of the Lambs (1991)
6- Hereditary (2018)
5- Nightmare on Elm Street (1984)
4- The Shining (1980)
3- Poltergeist (1982)
2- Alien (1979)
1- The Thing (1982)

Murder by Decree is an absolute classic. RIP director Bob Clarke.

You hit all of my my top ten (which includes Amytiville 2 🙂) with exception of two flilms that didn't even make your reserve list which was of surprise to me, 'Jacob's Ladder' and 'The Wicker Man'.

The Fly also shows the  horrible consequences of technology.

The fellow that owns The Incredible Shrinking Man oughta kick some cash your way.
You sold it.

Lambert's off camera death is one of the most frightening and incredibly sad deaths I have experienced in a film.  It's horrifying and simultaneously heartbreaking. So raw and so real feeling. I first saw it on its opening weekend at 14 and that stood out to me even then. One of the greatest cinematic moments.

The Thing is my fav movie

The Wicker Man (1973).
Still disturbing.

Shrinking Man and Hell House are both written by Richard Mathison. Shrinking Man was first a book by him and was amazing but of course, his most famous novel is I Am Legend. He also was responsible for the best Twilight Zone episodes, one of which (yes) was redone with John Lithgow on an airplane.

The Texas Chainsaw Massacre is a masterpiece. The sound design, the camera work, the art direction, the naturalistic acting..wow. There is not one thing that could’ve been improved upon. It’s one of those films that you had to have either watched in theaters back in the day or see it in the right mood and setting to really appreciate.

Mr. Ager as a fan of yours and of horror,  thank you for solving the mystery of a film whose title has eluded me since childhood. For years I have been describing the plot of "The Legend of Hell House" to every horror fan I know and no one had any recollection of the film or its title. My sincere thanks, sir.

Stumbling upon this channel was a blessing

Love you for this! barely any spoilers but satisfactory reviews for sure! your fans lucked out when you decided to expand the list to 25!!! your work is greatly appreciated Rob!