While it seems perfectly intuitive that a traction wheel would have more traction than an omni wheel, this isn’t actually the case. Omni wheels actually have considerably better traction than traction wheels, as shown in this post. At least, for the old wheels. It seems like a test with the new traction wheels is in order, but I would still put my money on omni wheels for better traction.
That said, nothing compared to the amount of traction from a custom flex wheel traction wheel, which is why many people use them in the middle of a 6 wheeled drive. It allows for more traction when pushing, and is highly resistant to being pushed sideways, which seems good this year for roller control.