User blog comment:Fliu/Chapter 956 Thoughts/@comment-198.232.93.121-20190919202555/@comment-3185063-20190919211624

The territories that are up for his taking at the moment (notably Tottoland, even without a whole chunk of its most powerful fighters) is rife with Devil Fruit users.

Tottoland has people like Katakuri and Brulee (and possibly Oven) still there.

Alabasta has a handful of Zoan users (Pell, for example), though Blackbeard would most likely be after that place for the territory rather than the Devil Fruit users there

Amazon Lily has the Boa sisters, and then there's the likes of Buggy, Alvida and Galdino

Personally I think he'd be after either Alabasta or Tottoland, and, given his mention of the Marines, I'm gonna say Alabasta.