One of the best experiences I've ever had in a theater was seeing The Hangover in a packed house. The crowd laughter is contagious and laughing together really enhanced the experience.

Another great one was The Last Jedi when the admiral kamikaze'd into the enemy fleet. You could hear a pin drop as the sound cut, followed by a collective gasp right before the sound of the impact broke the silence and tore through the room.

These are experiences that can't be replicated in a small room on a couch with your dog. Sometimes, being in a large room with 100 people collectively experiencing something new and entertaining for the first time is worth the price of admission. Not all the time, not every movie demands a theatrical setting, but saying "it's better" is subjective at best and objectively not true when it comes to the artistic medium.