Hot Toys Predator stuff is great, and this new diorama statue by Sideshow is also a must have for Pred fans, but I wouldn't compare them to each other... don't see the point. Hot Toys makes kick-ass Predator action figures. When they make the P1 Predator, it will be a must have, too.
Sideshow rules when it comes to polystone statues, and anyone who wants a great-looking static P1 Pred to display for a reasonable price can now have one! This will do very nicely for me, since the maquette and CM are just too expensive for my collecting budget.
Edit: Okay, I see you were talking about HT dioramas... none of that even comes close to Sideshow's stuff.