Which is better for anxiety, mindfulness or meditation?

They work together rather than competing. Mindfulness helps with anxiety by teaching you to notice anxious thoughts without being swept away by them, and meditation is the training ground where you build that skill. A regular meditation practice tends to make everyday mindfulness more available exactly when anxiety spikes. So it is less about choosing one and more about practising in session and applying it in the moment. StillMind guides both, with sessions shaped to how anxious you feel that day.