Can't speak for the Gator line but I can tell you that the Husqvarna TitaniumForce™ Trimmer Line is excellent. I will use their description of the line to describe my experience with it.
TitaniumForce™ Trimmer Line
With the patented Whisper design and a formula which includes Titanium, it’s considered by many pros to be the best line available. It accelerates faster, wears longer, has level flight characteristics, low fuel consumption and is quieter than other lines. Try Husqvarna TitaniumForce™ Whisper trimmer line, and you’ll never settle for anything less!
I paid about $11 for a 280 ft roll. So far it has been excellent.