Power cleans will hit your lower back and shoulders with just a little upper back. Barbell rows will hit your upper back hard, with just a little lower back.
As far as what's better, that's hard to say because they're different movements in many ways. I would, however, say that rows are far more important to include compared to power cleans.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)