Smb VS afp. Which is better?

When I use smb this is the speed more or less:

SMB

read: 14  MB/s

write: 51  MB/s

Why is reading so slow?

AFP

read: 35  MB/s

write: 22  MB/s

Why is not catching 51 mb/s like SMB, but now is better reading?

I’m confuse.

SMB:

SMB

AFP:

afp

Faster writing than reading? There’s something wrong here.

What share permissions do you use for the test?

Public folder.

I’m using Mavericks in a Macbook pro and ASUS RT-N16, but if I connect WD directly to my mac get the same speed, is a problem from Mavericks or WD my cloud?