There’s nothing really wrong with GarGraves track, it might just take a little more patience during installation because of the inconsistencies in dimensions. If you push multiple curved tracks together tightly, the resulting arc might be more or less what is expected. SCARM and other software assumes the same dimensions from one track to the next, so the track might not line up exactly with the software design.
I don’t know how much the difference between solid vs hollow rail makes with noise levels, especially acceptable noise levels, but I’ve listened to Atlas and ScaleTrax, both solid rail, and they are the quietest I think I’ve heard. The track at the Scottsdale Railroad Park is whisper quiet IMO. That said, I think John is correct that the more important part is the decking; quality plywood, Homasote, roadbed, etc.
The beauty of GG (and ScaleTrax) for me is the flex track that allows one to easily add sweeping curves to long straight sections for variety and slightly more realism, plus compensating for slight alignment variations during install.
Cost is also a big plus, especially when matching with Ross switches that aren’t cheap either. Atlas did have switch problems in the past, but I don’t think that’s still the case. However, availability might still be. I don’t know where GG source’s its rail, or the wire to make rails, so I’m not sure how accurate the Made In USA moniker is. I suspect though that it’s easier to keep wire in stock from overseas sources than it is finished products. The bottom line is there are excellent model railroads operating on all brands of track.