Most if not all extracted oils are bad for our health.
They are totally fine when they come in the same package with other ingredients in the food. For example fats in the walnuts or avocados are great, but if you extract them and put them in foods or bread they aren't healthy on its own.
Therefore margarines and butters aren't healthy. Maybe some exist but I haven't found any scientific evidence to support that. Only comparisons what's less unhealthy.
Plant based margarines are less unhealthy than butter, but to my knowledge, there are no healthy options/replacements.
Vegan butters are created mostly to provide alternative to dairy based butters, where animals aren't exploited in the process. Many try to make their product less harmful, but I wouldn't trust that unless I see an evidence.