Britney will own them on pop radio, her core format, and will have massive digital numbers.
Very true, but they're in completely different genres. Brit isn't known for her hot urban singles... :] Jay and Kanye are both rappers, so their stuff will likely be more catered to urban stations.
You guys turn everything into a competition lol =\
In album sales I'm pretty sure the only rapper that can go head to head with Britney is Eminem (although Kanye + Jay combined is powerful). But in terms of singles it really just depends on who has the hotter one...tbh I think H.A.M is just going to be an all out, old-school rap track. First singles for Rap albums are rarely huge successes because they're 'street singles' soooo who knows. Probably won't be very radio-friendly.