None of them.
Nothing will ever rival the driving/owning experience of a proper classic motor. Its all about roughing it, rebuilding engines in your living room and tinkering with spanners.

In 50 years time any 'current' car will still be a computerised mess of fine precision technology that will still be out of the reach of most home tinkerers.

Having stripped A series engines, washed mini slave cylinders in the sink and ground lugs off carbs to make em fit manifolds they shouldn't I can't see anything like that being possible with a Mondeo/Scooby/Evo etc.. in the future.