I have kept Delawares for years and I have many owls... never lost a one to a owl. I don't know why people think white means they will be prey to birds of prey.... it's more about size. A brown bantam will be taken long LONG LOOOONNNNGGGG before a white Delaware.
But to answer your question, I'd go with the following (from friendliest on) Faverolles, Delawares, Cochins... again, if owls are your main worry, go for heavy breeds. Hens that are 7lbs and up.
I think where the "white birds get eatten faster" thing comes from locally, is that in general (not the BYC population but regular folks) people around don't know breeds. So you ask, "what kind of chickens you have?" and they answer "I got me some red ones now, them white ones got killed off by something" and what they are really saying is that they have some sort of red breed (generally "red" are RIR, NH, or production red... all heavy) and "white" are leghorns... which are flighty and small.
Sorry to ramble but working in a feed store I learned what people were really saying. "white" is leghorn to most around here.... the kill rate is due to their little bodies. Their color doesn't help, a brown leghorn will last longer....... but a Delaware and a brown leghorn - leghorn will be eatten first. Willing to bet great money on it.