There's very little advantage IMO. I've used both. I always end up back at Nginx. Traefik was just another configuration layer that got in the way of things.
Traefik is waaay simpler - 0 config, just use docker container labels. There is absolutely no reason to use nginx these days.
I should know, as I spent years building and maintaining a production ingress controller for nginx at scale, and I'd choose Traefik every day over that.
