My view from the ground is the Gateway team brought a product to market first, and all the rest are just copying to keep up. Perhaps there is some parallel development from the other groups, but we have yet to see anything. So for the moment the gbatemp community consensus is that the Gateway team is doing all the work and the clones are getting a free ride. So is it really a good idea to buy clone hardware at the moment? Depends on where your loyalties are.
As for the quality of the clone builds, they are okay, some might say better than the original. As for the R41Gold, it seems they are using FPGA with double the capacity of the Gateway. Sure you get more, but will the R41 team figure out what to do with all that extra space.
My money has been on the Gateway team from the start, if I were just coming into the scene, I think I would still choose Gateway.
This should be the Gateway team's motto:
You ain't seen nothing yet, the best is yet to come.