Which NLE is best for graphics you ask?
It really depends on what you are working towards and what environments you are used to. If you are working on simple image graphics, the standard is Adobe Photoshop and Illustrator depending if you are in need to vectorize or not.
If we are discussing motion graphics, this is where it gets slightly tricky. If you are a Mac OSX user, you have some options. Apple's Motion software is a single instance paid application that is a powerful tool for Apple users that are familiar with the Apple ecosystem, Final Cut Pro X, and even iMovie style UI. Motion is locked into Apple exclusively.
Other users that are on PC have mostly the option of Adobe After Effects. After Effects is a widely used graphics editor as there are infinitely many plugins as well as compatibility with both Mac and PC. Users can easily send projects back and forth as long as the elements of a project are accessible between multiple machines. There are many other NLE's