[c-nsp] what is best data center vendor ?

[Mohamed A. Monsef]

Hello Experts

I'm studying data center products of different vendors and i see Cisco is
marketing Nexus family switches
as the best switches can support virtualization and cloud computing
applications in data center
However i see Brocade has a large portfolio also with multiple success
stories but no fabric solution is available for now
what is the best vendor ?
if anyone has experience with both vendors i need to hear your opinion