Interesting selection. A couple of people I know have small wheel cargo bikes, mainly used for their child carrying abilities. Not what you asked about, but I have learnt two things about small wheeled bikes from them, which might be helpful.
First, they ride great, no stability issues. Second, they use really wide rims, and tyres to match, which seems to be a big factor in that. They also use good spec Bosch electrics.
Looking at the bikes you highlighted, my favourite visually is the Raleigh, and it looks to have the chunky wheels/tyres. The Cube looks a bit upright and too short between saddle and bars. The Orbea rear wheel looks further back than necessary, although the extra wheelbase might be a good thing.
The Orbea is bottom end Bosch Active, the others are Performance. Better for towing.
The cargo bikes I mentioned are Tern (sorry
@guerney) GSX, very expensive but absolutely loved by owner and kids, and Momentum PakYak, somewhat cheaper, larger 24" wheels, currently available 25% off in places.
Edit:
Raleigh has hub gears (good) but only 5 speed (not so good).