If you’re going to be using alternative or additional Gmail apps, you don’t want to complicate your life. Look for apps that have easy organizational tools that help you clean up your inbox. So, always check if there is a desktop and mobile version of your email client.
Things to look for in a Gmail Mac app to determine if it’s good for you: What you consider to be “good” might rely on how you’re using your emails. But just because it “does” a certain function doesn’t mean it’s any good.
It’s crazy today that there’s an app for practically every requirement.