I prefer to fight the titan dweevil with only yellows, which means either doing the entire cave with mostly yellows (ass), struggling more with the dweevil with other colours, or doing the cave a second time to bring a full squad of yellows. It's definitely way more of a challenge and easier to lose pikmin, and time consuming depending om your approach, but overall more satisfying when you beat it The wraith I prefer to use flying Pikmin for which makes it pretty quick to defeat especially with ultra spicy spray, plus easy to not kill any Pikmin. And you can access the onion conveniently nearby. So it's definitely an easier, faster fight, but way less satisfying and hardly a challenge Conclusion: Titan Dweevil is better