[Overdrive]

I'd say the two are pretty comparable depending on what you're willing to spend. There are some differences, such as Robbins using these small elastic straps as a means of keeping the canvas from falling out of the channel when it's closing (a known problem with the old 986 tops that can still happen even with these straps in place, just something to watch out for), and the GAHH top having more highly visible lines for the defogger on the glass.

I'm pretty sure they both offer a top of the line version of the top made to block out a lot of wind and road noise that the regular tops do not, which is especially good for owners of the cars that were made before headliners were being installed from the factory.

Honestly, either brand's offerings are going to be better than what's already on your car if it's more than a few years old or wasn't maintained properly during its lifetime.

As for this guy who will come out to install the top for you, just make sure he doesn't do a rush job that leaves you with creases, wrinkles, or sagging points in the material. That material needs to be pulled nice and taut over the frame so that when it does stretch naturally from use as it breaks in it doesn't sag.