It’s been a while, and like I said, I haven’t done proper analysis (that would probably be another three or four days work at this rate) but from memory soylent is a lot closer to an actual meal (at least an attempt at a complete protein, a reasonable amount of carbs, essential fatty acids, a wider variety of micronutrients) even before you add whatever liquid you’re using. Total is just fortified wheat flakes, sugar, honey and salt. Pragmatically, if you absolutely had to subsist on one of them, I’d say soylent is probably the less-bad option, but I wouldn’t recommend either.