I think Jaguar has the most history, significance, brand awareness, and upper crust cachet. When I say "Jaguar" I think of the green exterior, creamy interior with lots of wood, some Brit or artist, cat's reflexes and big engine, perhaps racing history, the original XK... when I think "Saab" I think of the quirky bathtub round-windshield 900 or hatchback 9000, which was unique but not exactly luxurious to my eye.
Saab has lost much of its history, funds, and lately Scandinavians have not been key in the design studio, unlike Ford which has infused cash into Volvo and let it do its wonderful thing. Ford has also let Jaguar produce cars like the XJ which really are great vehicles, unfortunately undervalued and overlooked presently.
However, I think GM is more committed to turning around Saab in the future with baby steps, whereas Ford has sunk so much money into Jaguar without return that they are looking for a way out - from anyone, to put toward their more mainstream brands.
With or without Ford, I voted Jaguar.