ALIEN: WOW. 33 years later and it remains, by far, the greatest movie in BOTH the true Sci-Fi and Horror genres (SW being more Fantasy.)
Design was stunning. Nobody to this day has done a starship interior better than the Nostromo (minus that banks of blinking bulbs convention.)
Pace, tension, characters, mood, everything spot-on. 10/10
ALIENS: Great fun amidst the terror. THAT'S a follow-on. 10/10