I would agree, but the difference is likely more than that.
If you want to get involved in any way and get a nice return, you will have to purchase GBYTEs.

Now is a good time, since it's price against bitcoin is at a low point.

The problem if you hold GBYTEs on August 7th is that the price will most likely fall, so both your investment and your reward will lose value compared to bitcoin.
What is a 20% reward is going to be a smaller percentage if we take bitcoin's price as a reference, and therefore the profit with this strategy should be significantly higher than the profit of holding GBYTE.