Macbook Pro 13 or 15"?

I'm in my first year of university majoring in Marketing and my current laptop is over 5 years old with a battery life of 40 mins... So I need to upgrade and have decided to get a Macbook Pro, but I want to know which one I should get, the 13 or 15 inch screen. I will be using it for note taking, creating ads both video and poster, presentations and graph work, gaming occasionally as well as watching videos and all the regular stuff like social media and email. Price isn't an issue but I want this laptop to last for the rest of my 3 years in school and also after in my work place. Thank you!