Push and pull vs push

Push-pull will technically always be better, but by how much? Generally not too much if the setup is researched appropriately beforehand. You'll most likely end up spending an extra $30-50 on fans (assuming you're buying good ones) for maybe 3-5C at most, so that may not be worth it to you.

It also depends on the fans you're using - slower fans tend to work better in pull, while faster fans work better in push.