You will cause permanent and non-repairable hearing damage/loss if you fire a .44 or .45 without hearing protection. You may not notice it initially, but such things are cumulative.
Either will work for your needs.
I agree with both the comments above. I got flamed once for talking about hearing damage. A keyboard warrior informed me that he'd fired pretty much all calibers known to man without hearing protection and didn't have ANY hearing loss, so obviously I must be a wimp.
