With piety assuming you left it on non-stop you would use 1,374 prayer points each hour, which is ~144k gp/hr. This will be a significant difference. With superhuman strength assuming you left it on non-stop you would use 826 prayer potions each hour, which is ~86k gp/hr. Id go with piety for all it costs. [EDIT] Just as a clarification for anyone else looking at this and thinking about the numbers, this is using a prayer bonus of +13 and a prayer level of 70 (24 points per dose of prayer potion).