Union Thug writes:

The biggest difference between steam and digital is the amount of
information you can display is much greater with digital. Take the
speed tape for example, you get minimum and maximum values just like
steam, but you can also get flap speeds, manuvering speeds for each
flap setting, trend indications, trend vectoring, etc. You can display
much more information on a modern glass PFD and ND than you ever could
on an old school panel.

Being able to display more doesn't mean that the pilot uses or needs more, and
sometimes finding the needed information in a display system that provides
information overload can take too long for safety.

Some manufacturers are better than others, but
once you are used to these glass systems, you will find the hardest
thing is to fly an old school panel again.

That would depend on their design. I think that goal is achieved to a large
extent with the most evolved and expensive systems used on commercial
transports, but I cannot say the same for the small and cheap systems used on
private small aircraft.