Well, I was just kidding, the safest one is probably just Dsmashing, since you really can't screw that up and die. Suicide Dairing is not that bad if you can get a stock advantage, or you're pretty confident you won't die from it. I know that sounds a little stupid that suiciding doesn't kill you , but sometimes when you suicide Dair someone, their Up-B well hit you and allow you to get back on the stage. For example, Fox is Firefoxing off the stage, jump off Dair, his Up-B burns you and then you can Firebird back onto the stage. Yay!
By the way, I think you can actually Ledge-drop Bair and make it back onto the stage., although it is completely useless. You'll barely make it back on, and the hit box for it is not very large, compared to a drop rising Bair.