I have both..... but I use Cocos...
Exoticas are a great coal dont get me wrong, but they are a hassle to break apart and are very messy when you touch them, and its hard to get them the size you want them
It is true Cocos die out on one side. Thats why you cut them in half when you get them... it takes like 3 min with a knife and pressing on it to cut them in half... Once you do that they are the best coal and they stay hot and still last for a long time
Hope this help