I think back to the future was a overall better movie compared to the one I am about to mention. When it comes to time travel, I think "the butterfly effect" did it better. I liked back to the future better though
They are near perfect movies in every single aspect of film making. The best thing about them is that isn't permitted for anyone to make a mediocre cash-grab sequel for them. At least as long as Robert Zemeckis is still alive.