18/18 or 21/15, I would go for 21/15
max PS:
Lot of boucing these days with 1h -> high PS
max IF(only if you wanna use at least medium armor):
even with shield you get 2 shoted by 2h these days ...
if you wanna use no armor, I would spend the IF points rather in converting (only if 21/15 -> 3 convertions -> 1 point to spend) or (if 18/18) put them else where, just where you like it, riding, throwing, whatever ...
the rest should be self-explantional ... max shield, max atheltics, max wm ... all wpf to 1h
Edit: naked 1h/shield = useless :>