UGC outperforms brand-produced content on most engagement metrics across most platforms — it reads as authentic in a feed that has learned to skip past polished brand content. This is why UGC-style brand content (deliberately shot to look like UGC) has become a major paid-creative format.
Rights are the practical issue. Reposting a customer's photo to your brand account is generally legal under most platforms' fair-use posture, but using that photo in paid ads or off-platform marketing requires explicit permission. A short, clear request DM ('can we use this in our marketing?') is the right standard.
Programmatic UGC at scale (creator-marketplace platforms, paid ambassador programs) sits between UGC and brand content — useful, but losing the authenticity advantage that makes pure UGC work. The genuine kind is more durable.