It depends on fit rather than strength. For a first deep session focused on shame or old emotional pain, many people prefer psilocybin because it supports inward, feeling-oriented work and has a more manageable duration.
In practice, psilocybin sessions often give access to emotions that sit behind control or overthinking, which can open space for insight and softening. The shorter arc can feel less taxing when you are exploring vulnerable themes.
LSD can also be useful, especially if you already have psychedelic experience and intentionally want a long, drawn-out process. Its much longer duration asks for more stamina and willingness to stay in the process.
Choose based on your goals, experience, sensitivity to anxiety and control, any medications, and the quality of preparation, setting, guidance, and integration. If you are leaning toward psilocybin, read up and plan a careful intake with a facilitator you trust.
Wishing you clarity in your choice.