I have 4 children, 2 of which are twins and I can tell you without a doubt that twins are MUCH easier to deal with than singles.
Twins always have someone to play with, to sleep with, to help and to learn from. Older and/or younger siblings are just not the same, because if they are older they aren’t much interested in the “baby” stuff anymore, and if they are younger then all they do is mess stuff up and ruin everything. But having a sibling their own age changes everything.
Your twins must be better than my twins. My twins started fighting in the womb and still barely tolerate each other. They don’t even look like each other. They are both great kids and have done exceptionally well in school and get along well with other. My theory is that since there is no natural leader, they just keep trying to dominate the other sibling.