In the defense tree masteries, use the Tough Skin and Bladed Armor to increase damage applied thus shortening the time you take damage.

In the offense tree, Butcher will shorten jungle time more than 1% attack speed (+2 damage > 0.00658 extra AS). Extra points should go into Butcher before Fury.

Saying that (based on probuilds.net and other guides), J4 is a attack damage jungler, not an attack speed one. So AD runes will go further that AP ones

In the defense tree masteries, use the Tough Skin and Bladed Armor to increase damage applied thus shortening the time you take damage.

In the offense tree, Butcher will shorten jungle time more than 1% attack speed (+2 damage > 0.00658 extra AS). Extra points should go into Butcher before Fury.

Saying that (based on probuilds.net and other guides), J4 is a attack damage jungler, not an attack speed one. So AD runes will take you further than AS runes.