It always depends on the choice of the opponent. If the damage caused by the opponents weapon is less than or equal to 80 ({50,80}) choose the yellow armour, for the other available choices ({100,150}) choose the green armour to minimize damage per attack.
Regarding the choice of weapon, always choose green to inflict maximum damage in a given amount of time.
So the best strategy is to go with a yellow armour and green weapon if one has no prior knowledge.
It always depends on the choice of the opponent. If the damage caused by the opponents weapon is less than or equal to 80 ({50,80}) choose the yellow armour, for the other available choices ({100,150}) choose the green armour to minimize damage per attack.
Regarding the choice of weapon, always choose green to inflict maximum damage in a given amount of time.
So the best strategy is to go with a yellow armour and green weapon if one has no prior knowledge.