Most Efficient Symbol/Letter for Separating Text

For readable vertical separators (as per sswifts recommendation) :

; ----------------------------------------
; rhubarb
; ----------------------------------------

or for more emphasis :

; ========================================
; more important rhubarb
; ========================================

All monospaced fonts of course.

Not sure what exactly is meant by 'most efficient' ? Easy to type, read ? Energy efficient ? ( guess space would win that one )