Bugaboo butterfly or joolz aer +?

I’m looking at compact strollers. I currently have the Joie and whilst compact I find it so annoying to use and so I’ve had buyer’s remorse for a while! I’ve just read some reviews that toddlers figured out how to unbuckle their harness which is now worrying me. Any opinions on whether the Butterfly or Joolz is better? Are the harnesses secure? Also, looking for footmuff recommendations. The Bugaboo one looks incredible although pricey.