Just a feeling really, but I think Loeffler is so bad she's offputting to "middle ground" Republicans who could stay away from the polls for her.
Plus, to be blunt, I think Warnock has an enthused black base due to Abrams, which Ossoff won't benefit from in the same way, and Loeffler won't get the enthused female vote in any way shape or form. Demographics are a real thing.
I think Georgia still leans mildly Republican overall, just a gut feeling, so I think Perdue - by being quiet and having Ossoff as a fairly "milk toast" opponent - will just about get over the line.
I can't see comfortable wins in either race though.
BUT... I say all the above as by no means an expert in Georgian politics!