True! They are very different from each other in so many ways starting with art style and the open worlds in Sims 3.
I like the creative freedom that Sims 3 gives the player from taking pictures in game(tilting the screen) to designing almost everything in game with the color wheel.
I also like that you can play as a dog, cat or horse and Sims 3 has real unicorns.
And you can live on a houseboat and fish or walk almost anywhere in the game. I tried to turn the game inside out once....I can't explain...I got under the game and over the game taking screenshot zooming in and out.
I like the snorkeling in Sims 4 but I like how you can dive underwater in Sims 3 more.
I like the food and cooking in Sims 4 more though.