The PvE one looks like we're wearing buckets of what appears to be the old Gak ooze things kids used to play with in the '90s, but the overall effect's kinda neat, though I'm not a fan of the Green (they should've made it Red imo). Also, when you look at the Paladin in his sideways profile, he looks like he's letting it hang all out, like a real man should.
Seriously, the belt looks like a dong, almost moreso than the current PvP DPS belt.
Whereas for PvP, whoever did the design for Season 11 came back for 13 apparently and turned us into Templar Samurai Barbarians. It's really cool, and like S11, quite possibly one of the most unique sets we've received in the game. The helm, sword shoulders, and that leather harness thing - whoa.