I used Alacritty for couple of years, before switching to WezTerm almost a year ago.
There were two reasons for my change, the Alacritty devs are really obsessed with speed, which is good, but.. means less features, even _optional_ features like ligatures. I like ligatures, and because they slow down the rendering slightly the alacritty devs do not want to include it[0]
The other reason is that I wanted a way to have my terminal have two different colorschemes, light for the day and dark for the night. It seems that it might be supported now with alacritty[1]? But it does also seem like you need an external script still to do it..
I went with WezTerm because it supports both natively, everything else feels the same TBH, but the fact that WezTerm has more features that are optional, is what I liked.
Yes, I did, but it's been a while and I don't remember off the top of my head the details why I settled with wezterm.
What I can say is, that I find wezterm configuration quite pleasant. Overall I think they are in the same league but Alacrity gets a lot more attention and that's why I like to remind people that there is wezterm too.