The best replacement for smb is afp.

The best alternatives to smb are rated as following:
★★★★★  afp
★★★★★  nfs
★★★★  cifs
★★★  ftp
★★  samba
★  sme
★  cifs mac
★  smb2
★  iscsi
★  ginebra
★  nfs xbmc
★  afp mavericks
★  upnp
★  nfs share
★  sma
★  nfs speed
★  afp synology
★  alaska
  afp os x
  sftp
  ftp faster
  nfs faster
  ftp speed
  dlna
  nfs shares
  mcx
  air21
  webdav
  i2c
  derby ace
  nin
  afb
  netbios
  soho
  appletalk

Your alternative for smb is not listed? Suggest!
Speaking about smb, one probably shouldn't forget about astro.

Other search terms related to smb and their ratings are:
★★★★★ astro
You have in mind a companion for smb and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of smb in all years. Click on graph for more.
smb
afp
nfs