I'd disagree. Every saucer I've seen has come down with the smoke grain still burning. With a non-plugged forward closure, this means the chance of a burning delay grain coming really close to dry grass -- bad news.
Also, in my experience, saucers aren't very wind-tolerant -- the wind tends to blow them sideways when 3FNC rockets will still go fairly straight.
Our club has had to ban saucers, except when the ground is WET. Why? Because one of our two large fires was started by a saucer, and we've since had too many come down, as they all do, with the smoke grain still burning. Too much fire risk for us.
I'm not saying saucers should be banned, but I am debating the claim that "saucers are safer".
-Kevin