Sentinels and Paper Rex have similar playstyles in the way where it's calculated fast-paced chaos. But what makes them different Is TenZ is held back from being more aggressive. Benkai said in an interview that He doesn't hold f0rsaken and Jinggg on a leash, he let's them make plays whenever they feel like it. On the other hand, Shaz prefers TenZ to be more controlled.
Also, I believe Sentinels could've been more if they didn't copy the Meta and stuck with double duelist. They could've been what Paper Rex is now. Paper Rex has their own playstyle and they're not trying to be like everyone else.