This is maybe a soft question, but I think it is still relevant to proper typesetting with LaTeX.
I have a float with two or more tables. Should this be a figure or a table?
What if I have an arrow from one table to another, indicating some relation between the two tables?
figure
can contain not only images andtable
can contain not only tabulars. So IMHO the question does not discuss facts about the float implementation but opinions. BTW: Otherwise it would be a duplicate, e.g., of tex.stackexchange.com/questions/187512/… and should be closed too. Nevertheless, this is my opinion. You have the power to have another one.