i see two versions available for sale on is 5 tab servings and the other is 4. the 5 tab serving has 300mg caffeine from green tea vs the guarana in the other one. the 5 tab one also doesnt have methylsynephrine, ginger, ala, or capsicum and it has 45mg of pregnelone instead of the other which has 36mg. so basically im wondering which is the one everyone is always raving about because ive been wanting to try it