Evaluating NFL trades in the moment is, to put it nicely, an inexact science. Teams have more information about their players than does the public. The more honest organizations around the NFL will tell you that even they don't know how a guy they're acquiring might fit in their scheme or with his new teammates. The smartest organizations in the league have made some extremely bad trades. Deals that looked like steals at the time haven't been anywhere near as impressive with two or three years of perspective.
Let's take a step back and evaluate 18 trades from the 2018 and 2019 seasons and figure out who really won the deal.