What they share
Both are three-syllable classics with easy, approachable sound. Both shorten naturally (Ollie, Oz). Both have been popular across the English-speaking world throughout the 2010s and 2020s. Both pair beautifully with one-syllable middle names.
Pick Oliver if…
Pick Oliver if you want the softer, Mediterranean option. Oliver means 'olive tree' and carries a peaceful, sun-warmed feel. Ollie as a short form is warm and unpretentious.
Pick Oscar if…
Pick Oscar if you want the slightly edgier, more literary version. Oscar has Old English and Norse roots (and Gaelic revivals) and carries a different kind of energy. Oz and Ossie feel playful and confident.
Oliver is the warmer everyday pick; Oscar is the one with a bit more character. If you are drawn to literary namesakes (Oscar Wilde), Oscar pulls harder; if you want the quieter universal classic, Oliver wins.