E-Lite II addresses things like thyroid support (bladderwrack) and getting rid of edema (gotu kola, burdock). So there is less room per pill for ingredients that increase energy and decrease appetite, although these ingredients are included.

E-Lite Plus focuses mainly on energy - immediate and sustained. The Cocoa, Cha d'Bugre and Chromium address appetite/mood, and the Cha is also a mild diuretic.

Jubilee really hits mood/appetite with the addition of Vanadium and the extra theobromine (from cocoa). But we were also able to hone into the energy ingredient combination as well, so sell this aspect short.

Svelte includes ingredients that are potent appetite suppressors, invigorate and energize, and support digestive tract health and balanced blood sugar levels.  These ingredients combine to help strengthen your willpower to resist temptations, eat smaller quantities, and to inspire physical activity.

So, if I were trying to choose which product for a individual, here's how best to choose: if you are looking for an energy product: E-Lite Plus or Svelte.  If you have overeating issues because of moods: Jubilee.  If it seems you need full-spectrum support (except mood), go with E-Lite II or Svelte.  Also, the E-Lite II would be best for those with high blood pressure, although the other 3 are also acceptable - it's just the least stimulating of the three.