You could use two 20x4 LCD's if you want to. If you grab one with a I2C pack attached it's dead simple.
But really, it's more a matter what you want to display at a single time and how big. I mean, you can fit a lot on a small OLED but it's not very big. Fine it you use the project close range but you might want bigger if you're >1m away. Etc etc