In reply to n.LiVE:
I have small feet so the problems I had with cumbres and darts may not apply to you - I found the front of my boot would move from side to side with a dart on (I also didn't like the lack of anti balling plate) - I got rid of the darts and get some black diamond stingers (can replace the point too rather than needing to replace whole crampon when worn down) they have a better fit on both my Cumbres and Mont Blancs. I have found the Mont Blancs are a nicer comfier fit than the Cumbres. But everyone has a slightly different shape foot.
My partner uses stingers and sabertooth BD crampons on his cumbres.
Petzl crampons do not seem to fit so well on those particular scarpa boots my irvis's have very little length of front point, not because they have worn down but because the boot pushes so far forwards in the crampon due to the narrow toe profile.
I would go to a shop that sells both types of crampon and see how they look when you put them on the boot.