If you want to know technical differences, the quantity of certain ingredients are very different. For instance you can buy a very “complete” multivitamin (this also applies to meal replacements) with 100% of the FDA’s daily value for many micronutrients, but not all of them, such as potassium. This is because in addition to potassium being in many foods, it’s dangerous to receive a large amount of potassium all at once as in a single glass or a single pill.
Because Soylent is for the entire day, and diluted with water as such, you can (as far as I can tell) safely get the recommended amount of potassium in a day. There’s also a very large discrepancy between what level of potassium is recommended and what the average person gets in their diet. I thought when I looked at the IOM’s “updated” intake requirements that they would have lowered the FDA’s from 30 or more years ago. Not so, they actually raised it. I don’t know if this is the reason why I feel so incredibly focused on Soylent (I thought it might be placebo but it’s been 3 weeks) but I have my suspicions (I’ve taken multivitamins before).
Also of course since Soylent is for the day it’s much easier to carefully regulate calories if interested in fat loss.