For me Electra, Trek Pure, KHS Smoothie, and other Flat Foot frames are the most comfortable for city and multiuser improved paths. Not good if you want to ride MTB trails. Great upright positions for traffic awareness. I personally wouldn’t buy any of them as eBike but prefer to kit and get a better eBike. More info on where you’re riding can get better advice. It’s difficult to recommend a motor type without that understanding.