Choosing a best bike in 150 cc engine is not so easy you should observe all the features of those bikes some of them are:
The bike you choose must give the mileage on and average of 60 and above.
The bike must and should have the power starter to drive freely.
Most important note is that the bike should have the best and big head light to travel safe at nights.
You must check the shock observes and break system the bike that you choose.
And you need to check the engine model and style of the body work before you purchase the bike.
Mostly I prefer to chose hero, Honda, tvs, Yamaha bikes as those bikes are much standard. Thanks for view, hope this information might help you, Regards Ravinder.