Here is a proper guide comparing the two and explaining the IMDb discrepancy, so you can find the "better" version you are looking for.
The film spends 45 minutes establishing the mundane horror of the protagonist's life: the soul-crushing job, the empty apartment, the looming foreclosure. By the time the murder plot is hatched, you aren't rooting for the couple; you are watching two drowning people pull a third under. That discomfort is valuable. The "boring" parts are the entire thesis. body heat 2010 movie imdb better