Between the two, epi.
Epi-Strong is great because it has 15mg per cap instead of 10mg like Havoc. And it's still 90 capsules, so you are getting 1,350mg of epistane per bottle instead of only 900mg like Havoc, or Brawn (15mg x 60 caps). And Epi-Strong is only $50. The other two you can find for $40, but Epi-Strong is still cheaper per mg.