CIFS and NFS

Googling around I get the impression that NFS is much faster in reading 
files from the (NFS) server than CIFS from a CIFS server. For writing 
this is mostly the other way around; CIFS beats NFS.
Is this in essence true? Because if it is, I should choose NFS for 
mostly read-only shares and CIFS for read/write ones. Correct me if I'm 
wrong.
This is all on OpenSolaris-131

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