Only difference I see is cosmetic, the CMT orange vs more modest labeling on the Festool brand. Very subjective, but they feel a little looser when threading the bit on to the post.
Domino bits last a few long time. So I don't plan to be in the market anytime soon, but I wouldn't hesitate to buy either type. You can also get Festool bits in a pack of several to save money if you need several (e.g., just getting started).