Everybody is talking ‘wider is better’ nowadays. Yes a wide rim is awesome, but the wider the rim, the heavier they are. You need to consider the trade off for the width on a heavier rotating mass. The rotating mass doesn’t matter much once you’re up to speed but it does under acceleration which affects the handling of your bike, especially on twisty trails which require pedalling.
Consider that until only months ago, your average ‘trail’ rim would only be 21mm internal or there about. Which suggests even the 24mm would be a significant upgrade without adding much weight. The 30’s are AWESOME for handling. Ideal for bike parks and descending. But for your average ‘trail rider’ who wants to climb, descend and generally use their trail bike for everything, I think the 27mm offers the best of both.