Have driven both. Not a big fan of the interior of either. The Aston is however slightly nicer. Bentley headliner is overly VW and obvious Audi/higher end VW parts bin robbery. The Aston, Ford robbed Volvo and not much has changed, but just works better in the Aston. Flap paddle gear boxes--Aston well its annoying and pointless. Like manuals, but have driven many paddle shifting gimmics. This is one area that the Germans have done an o.k job, still prefer a manual, but could live with German cars with these transmission. Porsche obviously was a good help on the Bentley and Lambo's as well. Driving Bentley is better in shifting and being a sporting car. Aston might too American influenced or something. Aston line up kinda remind me of driving new Corvette's, almost bought an 08 of the latter. Strike against it and change of mind, its like driving an accordion and made worse with annoying paddles!
Both are good cars, agree with Top Gear on the Bentley. Its good but something lacking that makes it great. The Bentley, not as good looking and even the interior lacks a certain something. It just drives better.