In regards to Captains, I was not too concerned about the Speed stat OSRS Gold. I have 1 Morale 2 Seafaring, and 2 Combat Captains of the highest level available to me right now. (actually I think I've just unlocked a brand new tier but haven't seen any new Capts yet)

In eoc, weapons are significantly more important than skills in determining the amount of damage you can inflict. Choose one of the two options, Strength or Attack and practice it without touching the other.

A strike is pure advantage of the ability to use advanced weapons like godswords and chaotic mauls and the Noxious scythe, which can deliver high-quality and precise damage against opponents wearing armour. In EOC they can use the skills Barge and Slaughter which are essential for attacking targets who want to flee or use the Special Attacks of Claws or AGS to fight the legacy.

A strength pure is limited to one weapon of choice, which is the lv60 version of Tzharr-ket-om. However, can deal significantly more damage per level of combat with normal attacks compared to all other pures. Even though strength pures could have difficulty with accuracy in combat against people wearing armor, they do deal more damage than attack purifies against enemies with defense of lv1.

To reach lv60 strength, it takes less time than 75/80/90 attacking thus you can begin making PKs faster. Mauls are very inexpensive to replace in case you lose them upon death. Strength pures have access to the highly effective Berserk ability, but will need to invest in some attack levels in order to use some of the more effective Attack abilities in eoc OSRS Items, as well as completely lacking a specific weapon in Legacy.