Before you put on that first coat of anti-fouling paint, no matter what brand, you should look into properly preparing your bare hull with a barrier coat system. This is an sealer that prevents water absorbsion/intrustion into your fiberglass bottom, and also is the primer for the anti-fouling paint. There are several good companies in the area that can do the bottom for you and do it right. As much as I am a DIY guy, this is one task I don't mind paying someone else to do. To do it right, you should really take the boat off the trailer, blocked up safely. Not worth the hassle or the risk.
Where you dock your boat can also affect the paints effectiveness, near a strong current will wash away some of the ablative paints, so you buddy that is in a still harbor, may have good results, but a boat in the current may not fare so well. So when someone says that have always used brand "x", make sure the environment is similar to where you will be keeping your boat.
Best of luck on whatever you decide.