How wide you set your grip is going to be different for every single person because we're all built differently. That said, if you get a wider grip you will shorten the range of motion and that is a good thing. However, your shoulder risk goes up a LOT so wider grip I typically don't recommend most people do. Sticking your hands at the side of your shoulder is going to be throwing most that force on your triceps, and you're going to take a lot of your chest out of it. Which is like playing a sport with a man down, so it's not smart. If you're trying to bench as much as possible, you want to use every single muscle that you can possibly get. For most people, sticking your hands just outside your shoulders will keep your arms perpendicular to the bar running at a 90 degree angle - almost like pillars on a building. Pillars support weight, so I think that's probably the best option.