Handel and Woodall are safe, but they are both going to get a scare. Especially Woodall.
Why do you think Woodall is more vulnerable than Handel?
Woodall is more vulnerable than Handel. His district has historically been more Republican, but Gwinnett is trending Democratic rapidly due to increasing minority votes, and Woodall himself hasn't ever faced serious opposition during his entire time in elected office. Bourdeaux seems like a capable enough candidate who has outraised him consistently and who seems to have a fair amount of enthusiasm behind her.
Lucy McBath, on the other hand, is a person I admire and respect, but an atrocious candidate. Even die-hard Democrats I've spoken to in the district say she comes across as unpolished and inexperienced. Karen Handel already beat the most well-financed candidate in the history of congressional elections because he came across as inexperienced and too connected to national interests; why would she be unable to fend off an even less qualified candidate with the exact same flaws?