At least the bat bomb did actually prove to be moderately effective when they tested it; the bats managed to do quite a bit of damage to the air base at Carlsbad NM when a bat accidentally got released. Despite that, the project was still a hare-brained scheme with little chance of being successful enough to actually be worth the trouble, especially since it still wasn't operational when nukes became an option.[sigh] I guess sarcasm was not detected in my response. Neither bombing method made (or would have made) any significant impact to the war effort of either country.
On the original topic; as others have said, it makes no real difference.