There is definitely a system to it. Something like "split at the longest side of the current window" or so. I have developed a feeling for where my magit buffer

There is definitely a system to it. Something like "split at the longest side of the current window" or so. I have developed a feeling for where my magit buffer will show up. 95% of the time I am right and my eyeballs already move where it will appear. Anyway, if you want to get rid of some window/undo a split: C-x 0.