We use this slightly thicker cord shown in brown for our "boyfriend" bracelets.

We feel they are both quite strong and durable but the slightly thicker one might make for a more masculine look. 

Green cord shows our standard vs the brown which is slightly thicker

When requesting the thicker version on a dainty bracelet, keep in mind the larger silver bead must be used in the back for closing.

Here is the back of a finished piece using each size

Thick Vs. Thin Cord

Husband and Wife Morse Code Matching Bracelets  for Couples