Kant's And Utilitarianism Similarities

I struggled comparing and contrasting Utilitarianism and Kant's theory. I had to read through these sections several times in attempt to help me gain a better understanding of the two theories. I understand they both discuss attempting to achieve happiness, but how the two approach happiness is different. I struggle with deciding which theory is better in my opinion. While Kant's theory sounds ideal I feel like utilitarianism is more realistic because sometimes negative aspects will arise no matter the circumstance.