Gotta be the Jag surely, I've had both although my Saab was older and not an Aero but Jags feel special and are a lovely place to be where as 9-5's of any age look very dated inside and fwd isnt good news. Plenty of bargain Jags around too at the mo.
Thats what I've just got rid of, should be a really pearler for £2k though, the only thing which bothered me was a lack of toys,no cruise,no phone,no changer, maybe find a Sovreign instead?