The Chinese HT two strokes are easier to install but its a roll of the dice because I've heard some guys getting thousands of miles out of their chinese HT motors. I got probably 500 miles out of mine before I replaced the wrist pin bushing with a bearing and the person who bought it from me 3 years ago is still riding it around. Aslo cops tend not to mess with you because the motors are so small. Also a small 4 stroke is an option. Just like any other motored bike, always check your screws and bolts before riding.
Good luck on your choice and have fun!
Good luck on your choice and have fun!