Which type of handle bars are best for off-road & road use? There are quite a lot of types of bars. Some best bit for aerodynamics, some best fit for control, some offer significant amount of positions. 

I am looking to change my handlebars to the best fit type for both off-road rides which should offer a lot of control of bike and for road use, provide variety of positions, to gain aerodynamic form. 

I was using a curved handle bars (also referred too as raised bars) before, it provide a lot of control over turn, but except that it was fine.

And does the width of the bar affect riding?
The best handlebars for on/off-road MTB use are made of unobtainium:



They offer four hand positions including an acceptable aero tuck. The double bar also acts as a hand-shield. The loop at the front is useful for carrying shopping small distances. The total width is narrow enough to squeeze through gaps in traffic, hands protected so long as not using the bar-end position. You get 2x 'dashboard' for mounting lights etc.

The Scott AT4 was made by the earlier incarnation of 'Scott' and they have no  interest in making them now. The alloy is some last-forever furniture alloy so keep your eyes peeled on ebay for some.