It depends on the binding you are using, and what your objectives are. Silvretta used to make some bindings (models 300 & 400 I think) that were great for approaching climbs, but you wouldn't be carving any real turns in them. I don't even think they released, and I'm not sure that the heel locked down either.
Silvretta 404's were a beefier (i.e heavier) binding meant for going downhill, but they only had rear release. You'll still see a lot of people skiing these beacuse they fit virtually any boot that will accept clip on crampons. Good for people who only want to buy one ski setup that they can use with both mountaineering and ski boots. The newer model 500 is very similar, but uses carbon rails to lighten things up.
Bindings like the various Fritschi Diamirs & Freerides, the Silvretta 555 and the Dynafits are more geared towards cranking turns, not approaching climbs. Some (most) of them are not compatible with mountaineering boots.
So, while all of the above bindings can be categorized as randonee/alpine touring/ski mountaineering, some are better for downhill skiing, and some are better for touring and/or approaches.
When I want to get turns, I use my tele gear. When I want to get to a climb, I have an old pair of Atomic Tourcaps mounted with Silvretta 404s.
that actualy helps ALOT thank you