#1: SmackDown features more interesting WWE characters than RAW at the moment
Drew McIntyre is a great WWE Champion. Bobby Lashley has been booked in a dominant way recently which is why he can be a tough U.S. Champion to beat. Asuka was the best pick as the RAW Women's Champion after Becky Lynch went on maternity leave.
Seth Rollins and The Mysterio Family's feud has stretched across several months, though it is entertaining even to this day. WWE RAW consists of several important names as mentioned thus far, but no one has manipulated the creative narrative of WWE as effectively as Bray Wyatt. It just so happens that he is on SmackDown as of this moment.
Even Roman Reigns' alliance with Paul Heyman has revealed an edginess to the Universal Champion's character like never before. The Golden Role Models singlehandedly carried the Blue brand's integrity on their shoulders for a while after WrestleMania 36, and they managed to become one of the most entertaining parts about SmackDown as a result.
Alexa Bliss is in the process of reinventing herself in interesting ways after being "changed" by The Fiend. WWE has teased the arrival of a mystery woman on SmackDown recently. Then there are always stars like The Miz, Lacey Evans, King Corbin, and Otis, who are just great at portraying their gimmicks in the best way possible.
SmackDown on FOX certainly doesn't lack in the character's department right now.