If you are the average driver who never really heats up the brakes from extreme driving, towing, etc., then any of the name brand DOT 3 fluids will do. When I'm working on family cars, I will typically buy either Prestone or Valvoline, whichever one is on sale at the time. That said, Valvoline sells a brake fluid that is labeled DOT 3 & 4. Which means that it meets DOT 4, but also DOT 3. Of course all DOT 4 is backwards compatible with DOT 3, but I guess Valvoline is labeling it that way for those who are uneducated on brake fluid.
If you do driving that puts a lot of heat into your brakes, then skip the DOT 3 and go with DOT 4. In DOT 4 you will find a wide range of performance from one brand to another. But since you are asking about DOT 3, then I'll assume that any will do.