This is entirely based on your preference, but paying attention to the size of your
beer bottle for home brewing can save you from the hassle of decanting the yeast or other precipitated ingredients that may settle at the bottom of your beer bottle if they are too big - hey, you can not simply shake the bottle to mix them up. Moreover, the beer bottle size should just be enough for you to drink it bottoms up, since if there is much beer left, chances are they go to waste for drinking them after resealing may not taste as excellently as the first time it was opened.