Both receivers really deserve better speakers than the BAs to get the full benefit over lesser models. Which is best will depend a lot on personal sound preference more than one being better at a particular thing than the other. One person will prefer one but another will prefer the other. However you will not go far wrong with either to be honest. In general Onkyo as a brand is regarded as being slightly better with movies while Denon slightly better with music but personal sound preference will probably have the bigger effect.
What receiver do you currently have?