That depends on what the team wants though. As fans, we look at these binary rankings to compare prospects. But, for actual real world trades, context matters too. Sheffield was much closer to MLB ready than Graterol is. That gives Sheffield a significantly higher floor. On the other side of the coin, Graterol might have a higher ceiling, for a team willing to wait for it. They might have similar value to a team, or one or the other could have significantly more value to a specific team, it depends on what said team is looking for.