For those two builds:
Swordsman - Highlander C3 - Squire C3
Easy to solo, very high damage and nice utility for party and yourself with armor maintenance and repair, easy path
Swordsman - Peltasta C3 - Squire C3
Hard to solo, nice damage which falls off way quickly, but an amazing utility on party
You can also try:
Swordsman - Peltasta - Hoplite C2 - Squire C3
A bit of both worlds, great damage on hoplite skills and great tankiness. Good for solo or party (but doesn’t excel in none)
EDIT:
Forgot to mention that both highlander and peltasta c3 have armor break, and you can’t use Deadly Combo from squire C3 with 2h sword nor one hand spear.