There are a lot of options out there when it comes to toothbrushes, but making the right choice is actually fairly simple. You need a soft-bristle brush that is the right size for your mouth. Typically, adults need a toothbrush with a head that is half an inch across and an inch long, but this can vary based on the size of your mouth. Look for a toothbrush that provides adequate coverage to the surface of your teeth, but is not so big that you have difficulty reaching the back of your mouth.
Beyond size and bristle firmness, everything else is a matter of personal preference. So find a toothbrush you like and that keeps your teeth and gums clean, and go with it.