There is no preferred method, the decision is upon you. We just offer an alternative that, we think, is worth trying out. I, personally, prefer it over apt for it being prettier and more elaborate and not a cramped cluster of text. Auto-remove by default is not a good idea in my book, but can easily be disabled. Nala shows apps to be removed even more prominent than apt does. See my screenshot.
When it comes to speed, it is not the bandwidth that you have that limits speed with apt, but the fact, that Nala supports parallel downloads, which apt does not. Besides that, Nala has a fastest mirror tool that tests and selects the three fastest mirrors to fetch your updates from.
