pros cons controlling nested c++ classes enumerations?

what pros cons controlling nested open c++ classes enumerations? example, suspect have category called printer, category also stores information cost trays, have:

class printer
{
public:
    std::string name_;

    enum type
    {
        type_local,
        type_network,
    };

    category output_tray
    {
        ...
    };
    ...
};

printer prn;
printer::type type;
printer::output_tray tray;

alternatively:

class printer
{
public:
    std::string name_;
    ...
};

enum printer_type
{
    printer_type_local,
    printer_type_network,
};

class output_tray
{
    ...
};

printer prn;
printer_type type;
output_tray tray;

i advantages nesting private enums/classes, nonetheless comes open ones, business separate - seems some-more impression choice.

so, move why?