Well, for now, mechanical engineering has emerged in a strong relationship with science especially Physics.

So mechanical is better??

In my opinion. Let other share their opinion.

Ok.Actually i'm student of 9 class (doing O level) nd worry about what should I do in future.

Depends what you want to do with it.

Did you mean “Mechatronics” defined as an “approach aiming at the synergistic integration of mechanics, electronics, control theory, and computer science within product design and manufacturing, in order to improve and/or optimize its functionality"?

it depends on your interest i think first develop your interest read magazines understand the field in free time and then decides what u want to do what u want to be and for now try to focus on your studies...all the best Danial Khilji

Nowadays, all engineering departments are mixed up together due to need in the industry of such mix. So for mechatronics , you can say that it is a new mix between different sides of engineering as Abdessamad said. and it is mainly works in the side of robotics .

Danial,

I suggest that you should not study a topic purely because it might be better paid, or more 'popular', or for any reason other than whether you enjoy it or not.

All commercial activities change.

If you were to study any specialized subject, who is to say that it will become obsolete by the time you are halfway through a career?

I advise you to choose topics that you are enthused about, and focus on the basics of whatever it is - becoming too specialized too soon will lead to a very 'brittle' type of knowledge, and when you face a situation outside your experience you'll be hard-pressed to cope.

As many have said, read around your subject. There is no 'better'.

And in case the distinction is not clear, mechanical engineering will tend to focus on the fundamentals of materials, shaping and fabrication, mechanism design and broad aspects of system design.

Mechatronics (used to be called cybernetics when I was a lad) will focus on the interplay of electronics and mechanisms to achieve desired goals, studying feedback, software/firmware.

If I was in your shoes (I'm not, I stuck to Physics for my 1st, 2nd, and 3rd degrees, specializing as I went into space sciences) I would take mechanical engineering, but choose modules from electronics or mechatronics. Nobody will stop you from reading up on mechatronics in your own time. Nobody will stop you from building a desktop CNC from stepper motors scavanged from line printers. Nobody will stop you from buying an arduino. Nobody will stop you from selling mechatronic gizmos on etsy.

And generally, most university departments have bored PhD students in them that don't mind showing an inquisitive person around for an hour or so. What University are you close to?

it depends on the Level of students

If they are on U G degree the Mechanical is advisable...

and the Mechatronics is advisable when the students are much specific what to do in future...

If u take mechanical u will be having a wide scope,,, where as in mechatronics its much specific...

If they are job oriented its better to do Mechanical only....

what matters more is where u study....

I think mechanical engineering is better.

Both are good. I would say an interdiscplinary program is always good. Choose Mechatronics.