#4 Why Roman Reigns is better as a face: He's great at playing the heroic babyface
Roman Reigns has been on an unstoppable path since his return to WWE. He has defeated everyone who dared to challenge him and take his Universal Championship. Superstars such as Kevin Owens, Edge, Daniel Bryan and Cesaro stepped up for the challenge, but they have all been put down.
While this makes Roman Reigns look strong and unbeatable, it also makes it hard to come up with a top babyface star that is believable enough to dethrone him for the Universal Championship. There aren't enough main event babyface stars on the blue brand right now who could do that.
Normally, that person would be Roman Reigns himself. Whether it's conquering major names such as Brock Lesnar, Triple H, or Randy Orton, Reigns was great at chasing down the heels and he had enough credibility to defeat them.
#3 Why Roman Reigns is better as a heel: He can be more aggressive
During his days with The Shield, Roman Reigns was known as the powerhouse, as there's a good reason for that. He wrestled a more aggressive style, utilizing big moves such as the powerbomb, Superman punch and big boot.
Although it looked good then, it works much better now as he's a heel because it's easier for fans to boo a wrestler that is aggressive in the ring than it is to cheer for them.
As a heel, Reigns can use his aggressive style to generate more heat or go all out as we saw at Hell in a Cell last year during his match with Jey Uso.