I have a hubmotor electric, a happy time and a few regular bikes.
The electric is perfect for cruising the beach among the pedestrians or slowly cruising downtown on the road, sidewalk, alleys, parking lots, etc. It will do a short commute of a couple miles very well. Its easy on the ears. At 17 mph it is fast enough in town. I can do all kinds of short cuts through parks, trails and sidewalks. I think it is probably faster than a happy time bike in downtown riding because of the short cuts you can take. You can get away from traffic using sidewalks or trails. People think you are just riding a regular bike, the cops don't care. You can stop to take a break, sitting on the bike, talk to someone, watch some bikinis, and then when you want to go, just press the button and you magically and silently roll away. It is quiet and clean. Unfortunately it slowly starts to run out of power after about 10 miles or a half hour of full speed riding. It sucks to wait a few hours till it recharges.
The happy time is fun and will let you ride as long as you can sit on it. It is better for country roads, although if you want to show off your toy, you can ride downtown and on the beach. But as long as the motor is on the noise is a little annoying. You have to ride it more like a motorcycle, no cutting through parks or over sidewalks (although you could, but you would probably eventually get busted). Cops are going to be tougher on you if they decide to hassle you. Neither of my bikes are legal but I still ride them. I usually ride the happy times out of town where there are not many cops. The motor will push the bike faster than it should go over potholes. Happy time is a little less reliable than electric, although there are more reliable motored bikes out there. Happy time is oily, greasy and stinky. It will take you places far away. On smooth country roads, happy time is king. Trails are pretty fun too.
The regular bikes are quiet, clean and require just a little effort. I like the regular bikes best for distances under 2 miles. They are not as good at hills and require a lot of effort on hills. They are not as fast but you get some fresh air and exercise.
I use all three and like them all.