It's easy to think of a high-scoring game in a Pelicans-Suns matchup. Devin Booker, Zion Williamson, Brandon Ingram. These are all big-name scorers. 
But so far these two teams have shown drastic defensive improvement. How much? New Orleans gives up the fewest points per game in the NBA and the Suns allow the second-fewest points in the league. Shocking, I know.
The Pelicans' defensive improvement is not an early season fluke. New Orleans is better coached and stressing defense under new coach Stan Van Gundy. The Pelicans have slowed down their pace from last season when Alvin Gentry was their coach. 
The Suns are a work-in-progress with many new faces, including point guard Chris Paul. Part of why the Suns' defense is better is because their offense is slower tempo now with Paul running things.