The difference is mostly only of scale, how large the culture you start with and how much plasmid you end up with. For most purposes mini preps are sufficient but there are certainly times when you need more DNA or intend to use a certain plasmid over and over again in which case more DNA is useful.
Hello, it is in relation to the quantity of DNA that you will extract. The quantities of DNA obtained after extraction are as follows: more high in the maxiPrep than in the Midiprep, and higher in the Midiprep than in the miniprep.