On Sun, 29 Apr 2012 10:30:37 -0400, Abdelkader Chikh Daho said:

I wan to ask for your feedback about these two devices : Juniper MX960 with SCB-E and Cisco AS9k with RSP400.

They both work well in some situation, and totally fail in others. It would help if you gave more detail what problem you're trying to solve. Also, are you sure that *those two* devices are the only suitable ones for your application, or do you want answers of "You may want to look at XYZ's model 915 as well"? http://www.catb.org/~esr/faqs/smart-questions.html is probably the most helpful answer I can give to your original query.