IONQ may be a better stock. However, headlines and PRs garner attention, volume, and price spikes. An ARQQ quantum computer reportedly beat a super computer at some assigned tasks, and may now have a demonstrated use and advantage.
News like this leads to an increase in share price.
IONQ rarely toots it's own horn and appears to be lacking in the PR department.
IONQ may be the leader in quantum computing now. However, all it takes to unseat a leader in a new and emerging field is some breakthrough discovery, a PR to follow, and the field of play gets tilted.