You can go back and forth all day about the quality of this or that piece relative to the rest of the brand's offerings, the prestige of the brand in general, whether or not a certain model is "Breguet-enough", etc., but ultimately it is usually an emotional decision to purchase one and for many people, they simply have to have a Breguet. For me, the one would most likely be the Type XX Transatlantique.
I simply love the movement (I've written extensively about it on this forum and also on WatchRap) and find the styling to be tasteful and utilitarian, the size to be just right and the Breguet name to be right up my alley. It's a great timekeeper, generally reliable and rugged and looks great doing it.
The resale value is not good, so definitely pick one up second hand if that's an option for you, but if you're buying for yourself and you're not the type to get bored quickly and sell it, resale value is of little consequence anyway.