I would say that PR systems are more likely to lead to an increase in women's representation, but typically when they're supported by quotas and there is some kind of quota in place, they kind of go hand in hand. Also, it always comes down to the will of the party. There are countries that use PR and women's representation is still low, so it really comes down to the party's will.
On June 12th, 2018. See this statement in context.