The covers you mentioned are absolute classics! I totally agree about "The Amazing Spider-Man" #300. Venom's design is so iconic, and it really captures the chaos and intensity of the character. The way it draws you in is just fantastic!
As for my favorites, I have a real soft spot for "Saga" #1. The image of that baby with the wings really hits you with curiosity and wonder, especially with the vibrant colors. It sets the stage for the wild ride ahead. I also love the covers of "Sandman", Neil Gaiman's series has some surreal and breathtaking artwork that really brings the story to life.
I think I lean more toward covers that have a lot going on. There's something so captivating about getting lost in all the details! How about you? Do you have any specific artists whose styles you really enjoy?