If we press most philosophers, ethicists, and humanitarians, they'd likely say the world needs more empathy above all else, because empathy is the root from which truth, justice, and equality actually grow. Without the genuine capacity to understand and feel what others experience, we can have systems of justice that are cold and punitive, superficial equality, and truth that's wielded as a weapon.
That said, here's how do these three candidates stack up:
Truth might be the most urgent right now. We're living through a crisis of shared reality, misinformation, propaganda, and epistemic fragmentation make it nearly impossible to solve collective problems when people can't even agree on basic facts. Democracy, science, and justice all depend on a foundation of truth.
Justice speaks to the corrective, the idea that wrongs need to be made right, not just acknowledged. Without accountability and repair, truth becomes hollow, and equality becomes a broken promise.
Equality, particularly of opportunity and dignity, addresses the structural conditions that make suffering so persistent and predictable. Many of the world's worst problems (poverty, conflict, health disparities) track almost perfectly along lines of inequality.
These three aren't separate. They form a kind of triangle, each one supporting and requiring the others. Pull any one away, and the other two collapse.