I even trim my wicks! Which, by the way, you should be doing too if you want an even pool of wax. I’ve also done quite a bit of writing about candles and tested a bunch too. As a result ...
It’s possible to expect the longer-lasting time from a large candle in some cases, but it’s not all the time. Smaller but higher-quality scented candles are always better than a low-quality candle.