Saab on the other hand is noisier (3" straight though exhaust system), has "firm" suspension and just 4 cylinders... :-/
But the Saab goes rather well (
) and is much more communicative in the steering. It is a car you really drive (damn understeer!)
Omega or Saab 9000?
Unless it is a Carlssson/Aero, I would choose the Omega. 
But, and this is just my opinion, the Aero is one of the most fun cars you can buy with the finest seats in any car I have ever been in!
Do I take it you own a 9000 Carlsson??
Have to say its one of those cars that was on my list of cars to own but I never did!!
I've always fancied a 'blown' 9000,one of my neighbours used to own one only he had to sell it coz apparently it was the cars fault he kept getting stopped for speeding!!
But the best one i've seen for a long time (and we're talking about 10 years back) was an oldish guy who lived in the Loughborough area.
It was a Dark green D reg,just that it had been lowered on 17" Compomotive MO's,MASSIVE brake conversion with 4 pots and unspecified horses under the bonnet...although the 'Abbott Racing' sticker on the back kinda gave the game away!!

One of the lads in the 21T club swapped his 21T for a 9000 Carlsson,he said it went better than the Renault but the handling resembled a barge!!! Very front end heavy he said but a superb car all the same.