The advantage of the GG plate is the version that is a dogbone style (lighter for a non-skeletonized SS plate) and set up for very stable, low profile, single tank mounting without needing a seperate single tank adaptor or a wing with built in stabilizers.
Others have the dogbone style, but GG is the only currently, commercially available hard plate (that I'm aware of) that has the single tank mounting profile.
Note: I'm ignoring the Freedom Plate due to currently long and uncertain delay in availability.
Also, you can often mix and match wings and plates from different manufacturers without hssue. Occasionally, the cam-band slots may not match well with mounting hole locations. But post up and ask - someone may be diving that combo, or get the measurements from the manufacturers and compare.