With Mojave, you can mute the colors of the interface, so you don’t find yourself blinded when working at night thanks to the Dark Mode. The most significant changes in the newest version relate to aesthetics. The only thing you should worry about is to update your apps, as the old versions won’t work on Mojave.
If you’re a user of Mac OS, upgrading to the Mojave version is the logical next step.
Besides the obvious advantages, there are covert improvements that will boost your Mac. You will get some handy benefits free of charge.