The freeride is stronger as Mike said and as noted has a greater DIN, though heavier.
Then why use it? For winter and spring, the extra beef of the binding is needed to power bigger, fatter boards for bigger, faster, more technical descents. Think go big, or go home
For summer, and some spring or winter ski traverses, where the goal is not hard descents--save weight with smaller skis, and the titanal 2's or dynafti tourlites.
Dynafits need a dedicated boot for attachment
Decide if you are big, and enjoy gravity like me, or tall, skinny and work hard for traverses when you get your bindings.
All said you could use any of the systems for all types of skiing, just not at a optimum application.
Just be happy you're not using the super heavy Alpine Trekkers--really only good for hardcore descents and big air (since you get to keep your alpine bindings) and those with huge powerful legs to carry all that weight.