Needed Help

Hello, my name is Michi. I come from the S-Class group and drive a S450. Now I’m looking for a “new” vehicle for my wife and could narrow down the search a little bit. Basically it’s about reliability! But should also have comfort and performance. As far as the Volvo S80 is concerned, we vary between 2 models: 1. S80 4.4 AWD Executive from 09/2006 with 115,000 km, very nice equipment and should no longer be affected by the initial problems of this engine. 2. S80 T6 AWD Executive from 01/08 with 139,000 km, full option, so really EVERYTHING about extras. I would like to hear your opinion about the 4.4, I ask you for very specific information about the T6. 1. I have read about the T6 of transmission problems. These seem to “only” concern the 4 gear automatic. The one found by us Geartronic. Is this also affected? 2. How is it ordered about the durability of the engine? Especially with regard to the [or DEN?] Turbo. Thank you for Your support… Greetings Michi