They can both win their initial market

Optimus, based on my research, is aiming large industry automation at scale as its first beachhead market. Helix, is aiming at home assistance as its initial market

basically, this translates to lower cost larger scale but slightly dumber Optimus, vs more expensive, a bit more niche market, but more intelligent helix, in the first 3 years after they launch their product

i believe both markets will find customers but who knows where future will be. Just think this question, if Robotics is indeed the future, it is hard to imagine Tesla is not one of the leaders there