I use the market gardner now, no reason to use either of those, but if I had to choose, I would choose equalizer. Why? Whenever I get to that low health, I am usually surrounded by enemies. I use the equalizer to kill at least 5 of them, and that will usually be all of them, then I can go back, with 5 kills! However if there are more than 5 of them (unlikely), I will get killed, but still get about 4 or 5 kills! Which is quite a bit.