Edit: Revised build as follows:
Swordsman > Peltasta c3 > Rodelero c2 > Squire c1
Main advantages
Slithering build which does not lock you into Rapiers.
Able to repair equipment in dungeons (if not using auto party matching)
Notes
You CAN repair in dungeons.
Source: https://www.reddit.com/r/treeofsavior/comments/4g88b3/squire_repair_usefulness_question_earth_tower/?
You cannot use base camp in dungeons
