Short version: Help Me is a classic retinol treatment that is mostly helpful for fine lines, a bit helpful for skin tone, and should be used all over your face as part of your night beauty regimen. Even Better only helps with dark spots and is intended to be a spot treatment during both your morning and night beauty routine.
Long version: "Help Me" by Philosophy is a night treatment that contains mostly retinol. It's good for a lot of things but is mostly good for fine lines. In contrast, "Even Better" should be used twice a day (not just at night) and is designed to help with dark spots caused by acne scars and sun damage, but will do nothing for your fine lines. (If you have them.) The primary ingredient in Even Better is CL-302 complex, which is for skin brightening. The good news is that, depending on how senistive your skin is, you can use them both. First apply Even Better as a spot treatment for your dark spots. Let it seep in for a couple of minutes and then, if necessary, use Philosophy Help Me over your face, neck, etc. as part of your night routine.
Personally I used Philosophy's Boost Powder prior to this for weeks, however the result is not as good as this one. I have used it for around 2 weeks already and it really show some improvement.