What is the appeal of supporting the Republican Party?
Neither party should have much appeal since both just end up doing the bidding of their wealthy donor class.
There are some politicians in both parties that I like though since they seem quite principled (Rand Paul, Tulsi Gabbard, Thomas Massie, Ro Khanna...etc).
As for Guillory, he was a Republican most his life and only became a Democrat briefly to better his chances of winning a specific district that was heavily Democratic.
His move back to being a Republican was hardly an epiphany and more likely another political move that I’m sure has been profitable for him.