Are wide-mouth or narrow-mouth bottles better on trail?

Wide-mouth bottles dominate expert recommendations because they accept ice cubes, scoop from streams, fit inline water filters, and are easier to clean. Narrow-mouth fans on hiking subreddits counter that they're far less sloppy to drink from while walking. Several mainstream picks (Iron Flask's narrow-mouth straw lid, Nalgene's narrow-mouth 32 oz) split the difference.