Choosing a bracket is a personal choice, it's a matter of what works for you.
The main idea behind a bracket is to keep the flash above the camera, even when rotated into the portrait orientation. Also, to keep the flash farther away from the lens axis.
The two main types of brackets for keeping the flash above the lens are the flip style and the camera-rotate style. They can both work well, it's just personal preference.
Keep in mind that you will also need an off-camera shoe cord...and they aren't cheap, so keep that in mind for your budget.