The higher the branch is, the stronger the clone is (so I heard ) BUT. It depends what your donor plant is going to be. IF its a mother than higher level is fine but if you are going to flower it then the bottom would be better. Sometimes it is hard to find a node from the bottom that is well enough to be cloned. I made around 20 clones in the past only 1 died. I found that DWC bubbler is easy to DIY and give good successs rates. I made a tiny DWC clone bubbler using a 2.1 litre lunch box size plastic box with 1 air line, it does 6 clones and they works well for small personal setups.