Pros - golden hour lighting in december is just stunning for photos, cheaper venue & suppliers (potentially) , weather won't be too hot, if between Xmas and New years some people might not need to use holidays for work, some people hate the pressure of having to do something good for NYE, so a wedding would maybe be appreciated.
Cons - weather if it snows and you have people travelling, if people have plans round Xmas they might decline.
I was looking at a NYE wedding, I was thinking its one year where people have to change their plans. If you tell people in advance they will save money for hotels and / or gifts. The only reason we didn't go for NYE wedding was the weather. I was worried about snow. Were doing Sept 2022 now, not too hot, not too cold! Whatever you do, you'll love it and everyone who wants to make the effort, will! Good luck xx