I've used several greens formulas: Barleans, Trader Joes, and Amazing Greens.
Barleans tastes nasty, thick and uber-earthy and green, like green bitters. It's vile, though the ingredient profile is good. Trader Joes is pretty tasty, berry flavored; in water it's still kind of nasty, but do-able, and in protein it tastes pretty good. Amazing Greens is kind of in between, flavor-wise, still pretty damn unpleasant to down. All three have great nutrient profiles. Oh, I've also use MycoGreen, but those are caps.
Oximega is without question the best tasting of the bunch. It's not even in the same class. It tastes downright good, with no qualification needed.
As far as nutrition, Barleans, and Amazing Greens seem to take the 'lets throw a bunch of green powdered stuff in there and call it a day' approach. Which is great, greens are awesome. We all need more greens. Trader Joes has the greens, but also a nice antioxidant profile, with fruits, green tea, curcumin, etc. Mycogreen takes a totally different tack, and adds in all kind of good mushroom extracts, which are potent immune system boosters and anti-cancer agents; if you want a winter immune product, or the anti-cancer effects, I'd choose Mycogreen.
OxiMega is interesting. It's the greens, of course, and fruits, which is awesome, but it also specifically includes some stuff to increase cardio-vascular health and endurance/recovery:
The second component of Orange OxiMega™ is a true sports greens product, which is the first of its kind. This is no ordinary greens product; it has additional complexes geared towards real athletes. The “Cardiovascular Complex” is full of nitrate donor vegetables, including a potent dose of red beet root, which have been shown to increase endurance, nitric oxide levels and cardiovascular health in exercising humans in a clinical setting. The key to these vegetables are the nitrates that are found in them and illicit this effect when they come in contact with the human tongue and GI tract. The enzyme, probiotic and anti-oxidant blends will help the body absorb and utilize the highest level of nutrients from your diet and supplementation for maximum results.
Very interesting. I'm curious to see how long term use pans out.