I went with the BionX 350, an assist type where you actually need/must pedal the bicycle to go anywhere. It has a pressure sensor in the rear hub axel that you can use to pick how much assist you want... 35% 75% 150% 300%, with a MAX of 29.5ftLbs, or you can ride it without any assist and can't really feel any drag from the motor.

Now what does that mean,? if you put 10Lbs of pressure onto the pedals you would get...

35%=3.5Lbs of assistance, would be like if you put 13.5Lbs of pressure onto the pedals.
75%=7.5Lbs of assistance, would be like if you put 17.5Lbs of pressure onto the pedals
150%=15Lbs of assistance, would be like if you put 25 Lbs of pressure onto the pedals.
300%=29.5Lbs of assistance, would be like if you put 39.5Lbs of pressure onto the pedals...

If you put 1Lbs of pressure onto the pedals you would get...

35%=0.35Lbs of assistance, would be like if you put 1.35Lbs of pressure onto the pedals.
75%=0.75Lbs of assistance, would be like if you put 1.75Lbs of pressure onto the pedals.
150%=1.5Lbs of assistance, would be like if you put 2.5Lbs of pressure onto the pedals.
300%=3.0Lbs of assistance, would be like if you put 4.0Lbs of pressure onto the pedals.

Makes the E-Bike riding just like a normal bicycle experience, except now you feel like superman going up those hills...

Then, there are those "other types"...

The crank rotation sensor, you can put in effort or not, just rotate the crank...

The throttle, you can put in effort or not, just press the throttle...