What is a better daily driver?

I haven't decided yet, but I know in about 1-1.5years my son will need to have his own car. He hates sports cars and such so we will give him our Ford Fusion Hybrid. That being said I'm wondering what is a good daily driver. I would like to compare three models in particular:

2012 Bentley GT I'm fine with 50k miles or so
vs
2014 Mercedes Benz S Class AMG 63 with say 60k+ miles
vs
2013 BMW M6 Convertible RWD say 50k miles


I've owned a MB before so I am familiar with them to some extend and I do actually love their interior. I also don't find them overly expensive service wise. I have test drove multiple BMWs - not M series - but find their interior kind of bland and they all kind of look the same regardless of the model.

I have never even been in a Bentley but have heard so many horror stories so I'm really curious to people who have driven all three or own a Bentley is it really a money pit - e.g. worse than McLaren which I have owned myself?

Thanks.

 

Thanks. I'm definitely going to take that into consideration. As of now, I'm heavily leaning towards a Merc since my wife hates to deal with headaches and we don't want our daily to turn into something that we can't use for months on end.